Bug 1472: Enhance GLMediaPlayer AV Sync: Utilize SCR aware audio PTS used as master-clock, enabling proper AV sync w/ untouched audio

We can finally utilize the added pass through audio PTS, see commits
- GlueGen 52725b4c6525487f93407f529dc0a758b387a4fc
- JOAL 12029f1ec1d8afa576e1ac61655f318cc37c1d16

This enables us to use the audio PTS as the master-clock and adjust video to the untouched audio.

In case no audio is selected/playing or audio is muted,
we sync merely on the system-clock (SCR) w/o audio.

AV granularity is 22ms, however, since the ALAudioSink PTS may be a little late,
it renders even a slightly better sync in case of too early audio (d_apts < 0).

Since video frames are sync'ed to audio, the resync procedure may result
in a hysteresis swinging into sync. This might be notable at start
and when resumed audio or after seek.

We leave the audio frames untouched to reduce processing burden
and allow non-disrupted listening.

Passed AV sync tests
- Five-minute-sync-test.mp4
- Audio-Video-Sync-Test-Calibration-23.98fps-24fps.mp4
- Audio-Video-Sync-Test-2.mkv

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