[confluence] Fixed Live TV mode labels for channeldown, stop, bookmarks, record

Fixed altlabel for toggle button record/stop recording.
[musicdb] adds 'singles' boolean option, if set to true will show singles in album listings, and use this in the Year listings
[videoscanner] ensure EPISODE::operator==() is const
[test] adds multi-episode test to videoinfoscanner
Merge pull request #5138 from jmarshallnz/singles_in_year

Show singles in the Year nodes in music db
Merge pull request #5139 from jmarshallnz/multi_eps_tests

Multi episode scanner tests
fix Stopwatch test
[touched] update git rev
Merge pull request #4941 from ksooo/confluence-videoosd-label-fixes

[confluence] Fixed Live TV mode labels for channeldown, stop, bookmarks, record
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
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
dvdplayer: observe pts counter overflow
dvdplayer: avoid short screen flicker caused by unnecessary reconfigure of renderer
vdpau: advanced settings for auto deinterlacing
player: fix rewind
OMXPlayer: some caching fixes for pvr