[python] add onScanStarted/onScanFinished and deprecate onDatabaseScanStarted/onDatabaseUpdated
dvdplayer: drop old remnant of masterclock
dvdplayer: let CDVDClock hold info on what is current master clock
dvdplayer: replace old frame sleep with timestamp based one

This avoid depending on frame duration in advance of next frame
dvdplayer: add support for allowing video player being master clock
dvdplayer: move selection of video reference clock to dvdplayer

CDVDPlayer is now the master of clock selection even in the
video reference clock case. This avoids the data transmission
between audio and video players for clock selection.
dvdplayer: add accessor for current clock speed adjustment to dvdclock

This avoid direct access to video reference clock in players
dvdplayer: let Discontinuity function take absolute timestamp and log

This allow caller to re-use timestamp that calculations where made on
to reduce effect from task scheduling and avoid logging corrections done.
dvdplayer: move limit check of clock discontinuity into dvd clock
dvdplayer: move sync after clock switch to UpdateClockMaster
dvdplayer: use master clock as basis for player to sync clock

TODO: move this into the players so they check on reception of packet
if they are the master of the clock.
FIX: [AE] if null sink is requested, return null sink
ActiveAE: stop processing passthrough packets for paused streams, fixes audio glitch on pause
[pvr] fall back on the channel icon if no thumbnail is available
for recordings
[guilib] repeat wasn't considered for translation of constants during skin load. fixes #14243. thanks vdrfan
Merge pull request #4804 from jmarshallnz/constantly_repeating

[guilib] repeat wasn't considered for translation of constants
Merge pull request #4785 from koying/fixaenull

FIX: [AE] if null sink is requested, return null sink
Merge pull request #4744 from tamland/onscan-rename

Python API. Rename onDatabaseUpdated and onDatabaseScanStarted
Merge pull request #4401 from Jalle19/fix-recording-thumbnail

Fall back to using channel icon as thumbnail for recordings
[python] bump API after 5c08c682a7aaec202488ab68f5eba796fe443a45