Updated LAV Filters to 0.63-8-85ebec3 (custom build based on 0.63-2-937180e).

Important changes:
 - LAV Video Decoder: Fix DXVA decoding for some H264 files
 - LAV Splitter: Fix the timeline for some MKV files.
PPageFileInfoClip: Various cosmetics.

 - Reduce the visibility of member functions and variables.
 - Simplify the initial focus handling.
 - Various clean-ups.
PPageFileInfoDetails: Various cosmetics.

 - Reduce the visibility of member functions and variables.
 - Simplify the initial focus handling.
 - Various clean-ups.
Properties dialog: Make some strings of the "Details" tab translatable.
Properties dialog: Convert the creation time to the local timezone.
Don't force any background color for the Shockwave graph.

This commit fixes #1747.
WebUI: Inform the web interface that no audio stream is available.