origin commit:
https://github.com/linuxmint/xreader/commit/43acb8f

Added the required preprocessor directives to make building without epub support possible.

Added the function to handle links from the toolbar, also added functions to disconnect all ev-view handlers once it has been replaced by ev-web-view, and vice-versa(to drop all handler associated to ev-web-view).

Also the unref call to job_thumb was causing thumbnail jobs to crash with GTK2, so had to revert that, now we're back to the document folder not getting deleted from disk.

You can now search through the entire epub document. In the next commit I'm adding support for webkit2 with gtk3.

I added the capability to search through documents. The search is quite buggy, and we'll be taking care of each bug one at a time.

..and other fixing other bugs that were present once the webview was added, like the escape key command etc. Will look to refactor the thumbnails into ev-web-view.c.

In the next commit I'll extend this search over the entire document.Also will incorporate document index(table of contents).

Alebit with a bit of bugs as far as navigation etc. are possible, we can read an epub document in Atril.
The document will be displayed with thumbnails, and all keyboard shortcuts work.
Menu options, the ones that I have currently added do work.

I Will now move on to features such as inverted colors, document index, etc, most of which should be simple to add.

Also made changes so that the presentation view does not fire up while displaying an epub document.

Also added the feature to copy text to clipboard using the Atril menu.