remove 'synctex' internally, work with external library instead

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-# __SyncTeX__
-
-This file is part of the __SyncTeX__ package.
-
-[//]: # (Version: 1.21)
-[//]: # (Date: Sun Oct 15 15:09:55 UTC 2017)
-
-## Important
-
-* Changes in version `1.21`
-
-	* Display query returns more results (as much as `1.18`)
-	* Remove a `\` character from the name of 2 test files.
-	* Change variable name `class` to `class_` because the former is a reserved keyword in C++.
-	* Adding a more portable unused variable management.
-	* Various cosmetic changes in the source code, including explicit declaration of `void` in forward function declaration.
-	
-
-* Changes in version `1.20`
-
-	One bug fixed in some initialization and different syntax to make some compilers happy.
-
-* Changes in version `1.19`
-
-	A long standing bug affecting only pdftex has been fixed by adding support to pdf forms. As a side effect, the synchronization algorithm gains in accuracy for all the engines, especially from pdf to source. Of course, there is a small cost in both memory footprint and computational time, but none is noticeable.
-	
-	Some technical changes in the API.
-	* more consistent type naming convention
-		* `_s` suffix for struct's
-		* `_p` suffix for pointers
-		* `_t` suffix for standard types
-		* `_f` suffix for functions...
-		
-		thus `synctex_node_t` has become `synctex_node_p`.
-		
-	* supplemental argument in `synctex_display_query`. Set `page_hint` to the currently displayed pdf page number (0 based). If this info is not available, set `page_hint` to 0, it corresponds to the old behaviour.
-	* rename `synctex_next_result` to `synctex_scanner_next_result`
-	* additional `synctex_parser_private.h` header where 
-	more API are exposed. For an advanced usage only (eg parallel synchronizations).
-	* `SYNCTEX_NO_UPDATER` preprocessor macro to deactivate some code useless to frontends.
-
-## What is it ?
-
-The *Synchronization TeXnology* named __SyncTeX__ is a new feature
-of recent __TeX__ engines designed by Jérôme Laurens.
-It allows to synchronize between input and output, which means to
-navigate from the source document to the typeset material and vice versa.
-Browse the source code for more information.
-
-## Contents
-This package is mainly for developers, it contains the following files:
-
-* `synctex_parser_readme.md` (this file)
-* `synctex_parser_version.txt`
-* `synctex_parser_utils.c`
-* `synctex_parser_utils.h`
-* `synctex_parser_local.h`
-* `synctex_parser.h`
-* `synctex_parser_advanced.h`
-* `synctex_parser.c`
-
-The file you are reading contains more informations about the __SyncTeX__ parser history.
-
-## Source
-
-All stable sources are available from [TeXLive repository](http://www.tug.org/svn/texlive/trunk/Build/source/texk/web2c/synctexdir/).
-
-Latest development sources are available from GitHub.
-
-Please notice that due to the complexity of the TeXLive TeX distribution, there might be some delay before synchronization occurs between various repositories.
-
-## Usage
-
-In order to support __SyncTeX__ in a viewer, it is sufficient to include
-in the source the files `synctex_parser.c` and `synctex_parser_utils.c`.
-The synctex parser usage is described in `synctex_parser.h` header file.
-
-More advanced usage is found in `synctex_parser_advanced.h`
-
-The other files are used by tex engines or by the synctex command line utility:
-
-```
-ChangeLog
-README.txt
-am
-man1
-man5
-synctex-common.h
-synctex-convert.sh
-synctex-e-mem.ch0
-synctex-e-mem.ch1
-synctex-e-rec.ch0
-synctex-e-rec.ch1
-synctex-etex.h
-synctex-mem.ch0
-synctex-mem.ch1
-synctex-mem.ch2
-synctex-pdf-rec.ch2
-synctex-pdftex.h
-synctex-rec.ch0
-synctex-rec.ch1
-synctex-rec.ch2
-synctex-tex.h
-synctex-xe-mem.ch2
-synctex-xe-rec.ch2
-synctex-xe-rec.ch3
-synctex-xetex.h
-synctex.c
-synctex.defines
-synctex.h
-synctex_main.c
-tests
-...
-```
-
-## Version:
-
-This is version 1, which refers to the synctex output file format.
-
-The files are identified by a build number.
-In order to help developers to automatically manage the version and build numbers
-and download the parser only when necessary, the `synctex_parser_version.txt`
-is an ASCII text file just containing the current version and build numbers eg `1.19`.
-
-## History:
-
-* 1.1: Thu Jul 17 09:28:13 UTC 2008
-	- First official version available in TeXLive 2008 DVD.
-  Unfortunately, the backwards synchronization is not working properly mainly for ConTeXt users, see below.
-* 1.2: Tue Sep  2 10:28:32 UTC 2008
-	- Correction for ConTeXt support in the edit query.
-  The previous method was assuming that TeX boxes do not overlap,
-  which is reasonable for LaTeX but not for ConTeXt.
-  This assumption is no longer considered.
-* 1.3: Fri Sep  5 09:39:57 UTC 2008
-	- Local variable "read" renamed to "already_read" to avoid conflicts.
-	- "inline" compiler directive renamed to "SYNCTEX_INLINE" for code support and maintenance
-	- _synctex_error cannot be inlined due to variable arguments (thanks Christiaan Hofman)
-	- Correction in the display query, extra boundary nodes are used for a more precise forwards synchronization
-* 1.4: Fri Sep 12 08:12:34 UTC 2008
-	- For an unknown reason, the previous version was not the real 1.3 (as used in iTeXMac2 build 747).
-  As a consequence, a crash was observed.
-	- Some typos are fixed.
-* 1.6: Mon Nov  3 20:20:02 UTC 2008
-	- The bug that prevented synchronization with compressed files on windows has been fixed.
-	- New interface to allow system specific customization.
-	- Note that some APIs have changed.
-* 1.8: Mer  8 jul 2009 11:32:38 UTC
-Note that version 1.7 was delivered privately.
-	- bug fix: synctex was causing a memory leak in pdftex and xetex, thus some processing speed degradation
-	- bug fix: the synctex command line tool was broken when updating a .synctex file
-	- enhancement: better accuracy of the synchronization process
-	- enhancement: the pdf output file and the associated .synctex file no longer need to live in the same directory.
-               The new -d option of the synctex command line tool manages this situation.
-               This is handy when using something like tex -output-directory=DIR ...
-* 1.9: Wed Nov  4 11:52:35 UTC 2009
-	- Various typo fixed
-	- OutputDebugString replaced by OutputDebugStringA to deliberately disable unicode preprocessing
-	- New conditional created because OutputDebugStringA is only available since Windows 2K professional
-* 1.10: Sun Jan  10 10:12:32 UTC 2010 
-	- Bug fix in synctex_parser.c to solve a synchronization problem with amsmath's gather environment.
-  Concerns the synctex tool.
-* 1.11: Sun Jan  17 09:12:31 UTC 2010
-	- Bug fix in synctex_parser.c, function synctex_node_box_visible_v: 'x' replaced by 'y'.
-  Only 3rd party tools are concerned.
-* 1.12: Mon Jul 19 21:52:10 UTC 2010
-	- Bug fix in synctex_parser.c, function __synctex_open: the io_mode was modified even in case of a non zero return,
-causing a void .synctex.gz file to be created even if it was not expected. Reported by Marek Kasik concerning a bug on evince.
-* 1.13: Fri Mar 11 07:39:12 UTC 2011
-	- Bug fix in synctex_parser.c, better synchronization as suggested by Jan Sundermeyer (near line 3388).
-	- Stronger code design in synctex_parser_utils.c, function _synctex_get_name (really neutral behavior).
-  Only 3rd party tools are concerned.
-* 1.14: Fri Apr 15 19:10:57 UTC 2011
-	- taking output_directory into account
-	- Replaced FOPEN_WBIN_MODE by FOPEN_W_MODE when opening the text version of the .synctex file.
-	- Merging with LuaTeX's version of synctex.c
-* 1.15: Fri Jun 10 14:10:17 UTC 2011
-This concerns the synctex command line tool and 3rd party developers.
-TeX and friends are not concerned by these changes.
-	- Bug fixed in _synctex_get_io_mode_name, sometimes the wrong mode was returned
-	- Support for LuaTeX convention of './' file prefixing
-* 1.16: Tue Jun 14 08:23:30 UTC 2011
-This concerns the synctex command line tool and 3rd party developers.
-TeX and friends are not concerned by these changes.
-	- Better forward search (thanks Jose Alliste)
-	- Support for LuaTeX convention of './' file prefixing now for everyone, not only for Windows
-* 1.17: Fri Oct 14 08:15:16 UTC 2011
-This concerns the synctex command line tool and 3rd party developers.
-TeX and friends are not concerned by these changes.
-	- synctex_parser.c: cosmetic changes to enhance code readability 
-	- Better forward synchronization.
-  The problem occurs for example with LaTeX \item command.
-  The fact is that this command creates nodes at parse time but these nodes are used only
-  after the text material of the \item is displayed on the page. The consequence is that sometimes,
-  forward synchronization spots an irrelevant point from the point of view of the editing process.
-  This was due to some very basic filtering policy, where a somehow arbitrary choice was made when
-  many different possibilities where offered for synchronisation.
-  Now, forward synchronization prefers nodes inside an hbox with as many acceptable spots as possible.
-  This is achieved with the notion of mean line and node weight.
-	- Adding support for the new file naming convention with './'
-	    - function `synctex_ignore_leading_dot_slash_in_path replaces` `synctex_ignore_leading_dot_slash`
-	    - function `_synctex_is_equivalent_file_name` is more permissive
-  Previously, the function synctex_scanner_get_tag would give an answer only when
-  the given file name was EXACTLY one of the file names listed in the synctex file.
-  The we added some changes accepting for example 'foo.tex' instead of './foo.tex'.
-  Now we have an even looser policy for dealing with file names.
-  If the given file name does not match exactly one the file names of the synctex file,
-  then we try to match the base names. If there is only one match of the base names,
-  then it is taken as a match for the whole names.
-  The base name is defined as following:
-  
-      `./foo => foo
-      /my///.////foo => foo
-      /foo => /foo
-      /my//.foo => /my//.foo`
-      
-* 1.17: Tue Mar 13 10:10:03 UTC 2012
-	- minor changes, no version changes
-	- syntax man pages are fixed as suggested by M. Shimata
-	see mail to [email protected] titled "syntax.5 has many warnings from groff" and "syntax.1 use invalid macro for mdoc"
-	- 1.17: Tue Jan 14 09:55:00 UTC 2014, fixed a segfault, patch from Sebastian Ramacher
-	- 1.17: Mon Aug 04, fixed a memory leak
-* 1.18: Thu Jun 25 11:36:05 UTC 2015
-	- nested sheets now fully supported (does it make sense in TeX)
-	- cosmetic changes: uniform indentation
-	- suppression of warnings, mainly long/int ones. In short, zlib likes ints when size_t likes longs.
-	- CLI synctex tool can build out of TeXLive (modulo appropriate options passed to the compiler)
-* 1.19: Mon Jul  3 20:03:56 UTC 2017
-	- the nested sheets patch was not a good solution.
-  It has been moved from the parser to the engine.
-  See the `synctex.c` source file for detailed explanations.
-	- there is a new synctex format specification.
-  We can see that a `.synctex` file can contain many times
-  the same vertical position because many objects belong
-  to the same line. When the options read `-synctex=±2` or more,
-  a very basic compression algorithm is used:
-  if synctex is about to write the same number then it writes
-  an `=` sign instead. This saves approximately 10% of the
-  synctex output file, either compressed or not.
-  The new synctex parser has been updated accordingly.
-  Actual tex frontend won't see any difference with the
-  TeX engines that include this new feature.
-  Frontends with the new parser won't see any difference
-  with the older TeX engines.
-  Frontends with the new parser will only see a difference
-  with new TeX engines if `-synctex=±2` or more is used.
-
-## Acknowledgments:
-
-The author received useful remarks from the __pdfTeX__ developers, especially Hahn The Thanh,
-and significant help from __XeTeX__ developer Jonathan Kew.
-
-## Nota Bene:
-
-If you include or use a significant part of the __SyncTeX__ package into a software,
-I would appreciate to be listed as contributor and see __SyncTeX__" highlighted.
-
-Copyright (c) 2008-2017 jerome DOT laurens AT u-bourgogne DOT fr
-