places-sidebar: enable both creating bookmarks and dropping files

- drag a folder to the top or bottom of the bookmark list to add
a new bookmark. a horizontal line will be shown and the mouse
pointer will have a '+' at its right side.
- if there are no bookmarks (and that section isn't shown), drag
a folder over the network section's heading. this will add a new
bookmark and make the bookmarks list visible.
- drag a file or a folder over some existing bookmark to move it
into the bookmarked folder. the mouse pointer will have an arrow
at its right side.
- if you want to copy a file or a folder there instead, perform
the same operation but hold ctrl during that. the mouse pointer
will have a '+' at its right side. no horizontal line will be
shown, so you will be able to distinguish this operation from
adding a new bookmark. :)

adapted from https://github.com/linuxmint/nemo/commit/f18c4dd842be0998cbe6a519d9904bfd9993ca3e
(thanks to @mtwebster)

fixes https://github.com/mate-desktop/caja/issues/345
closes https://github.com/mate-desktop/caja/issues/423

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