Add support for pasting files in xlib
Fixed indentation error
Fix possible double-paste bug

Fixed a possible bug where both text and files would be sent if the
owner of the selection allowed for both in xlib.
Add support for copy/pasting inline images in Xlib

Images can be pasted from the clipboard if the owner can provide them in
an image/png format.  No support for incremental pasting yet so large
images do not work.  There seems to be a problem with RGB/BGR encoding
but it only affects the preview, and shows up fine in other clients
(tested with venom).
Handle escaped special characters in filenames

uTox now properly supports percent-escaped URIs from dragging and
dropping and from pasting.
Merge branch 'master' of https://github.com/blucoat/uTox
Fixed decoding of RGB PNGs

This changes code in both xlib and shared with win32, so it's possible
that this broke something on that side as well.  I'm certain that the
corrections made to png.c are correct though.
Add support for incremental pasting of large images
Merge branch 'master' of https://github.com/blucoat/uTox into blucoat-master
windows fixes
Merge branch 'blucoat-master'