Internal filters: Support v210/v410 raw video formats.

Disabled by default.

Fixes #4690.
Updated LAV Filters to 0.62-30-f028803 (custom build based on 0.62-25-d440798).

Important changes:
 - LAV Audio: Improve the estimated duration for some MP3 files (fixes #4322).
 - LAV Splitter: Support transport protocol specific RTSP URL handlers.
 - Updated ffmpeg library.
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Don't force any background color for the Shockwave graph.

This commit fixes #1747.
Why "C:\tmp.srt"?
WebUI: Inform the web interface that no audio stream is available.
WebUI: Make use of new [hasaudio] info.
What the hell was intended here?!

Trying to make some sense of that code. Without much luck so far...