* (mpv) Allow screenshots to work with hardware acceleration enabled.
* Add a shortcut for the add_bookmark action.
* Add icons for the bookmarks actions.
* (Qt5) Try to fix a problem when exiting from fullscreen and the option
to stay on top is set to "while playing".
* (Experimental) Simplify changing style and stylesheet.
* (Screenshots) Keep compatibility with older versions of mplayer.
* Fix for Youtube.
* (mpv) If the option --screenshot-directory is not available change
the working directory so that screenshots work.
* Add option 'Prevent window to get outside of screen' in
Preferences -> Interface.
* Update stayontop after entering and exiting the fullscreen mode.
* Don't auto center the window if there's no video.
* (mpv) Fix playback with -v
* Add the option 'Pass the -playlist option to MPlayer' to
Preferences -> Advanced.
* Simplify the code for previous and next chapter.
* Enable bookmarks.