[dvdplayer] Fix streams for DVDs sync with lang settings gui
[dvdplayer] Fix DVD subtitles' visibility in various situations.
[Fix][DVDInputStreamNavigator] Disable subtitles if requested by the user via a dvd menu.
[subtitles core] set correct icon
[rbp/omxplayer] Fix streams for DVDs sync with lang settings gui
[rbp/omxplayer] Fix DVD subtitles' visibility in various situations.
Merge pull request #3638 from Voyager1/fix-dvd-subs

[dvdplayer] Fix streams for DVDs sync with lang settings gui
[subs] fix incorrect matrix specification
[subs] need to use the view rect, not the video destination rect, and make sure computations are done in screen space
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
videoplayer: some rework and documentation
renderer: bump buffers to 5
videoplayer: update frametime, it might change due to fps detection
videoplayer: give streams with invalid fps a chance for fps detection
dvdplayer: allow rewinding at end of stream, do a seek after rewind
X11: ditch SDL for video and window events
X11: Add xbmc icon
X11: add SDL joystick until we have a better solution
X11: factor out code handling device reset notification