[rbp/omxplayer] Handle mono playback of HSBS/HTAB videos
[configure/airtunes] - fixed typo
[configure/airtunes] - fix fallback to libshairport if libshairplay can't be found. Bail out if --enable-airtunes was given and none of both libs was found.
Merge pull request #3922 from popcornmix/mono_video

[rbp/omxplayer] Handle mono playback of HSBS/HTAB videos
Merge pull request #3972 from Memphiz/fixshairportfallback

[configure/airtunes] - fix the fallback to libshairport if libshairplay can't be found...
Revert "[WIN32] changed: use up to 4 parallel msbuild workers."

This reverts commit 162347f2b027ad7b333c5864a4153c5ece7c754f.

This change works fine if the windows vm is the only one compiling. Since the recent build logs showed a longer compile time when doing builds for all platforms I'll revert this for now to see if it was the culprit.
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
X11: move xrandr events to WinEventsX11
xrandr: remove method RestoreState
xrandr: observe orientation