Fix loading of subtitles containing entries with a null duration.
Updated LAV Filters to 0.60.1-5-974e300 (custom build based on stable version 0.60.1)

Fix a regression in LAV Video Decoder 0.60: MPEG2 decoding crashed.
Update SoundTouch to 1.8.0.
Update Changelog.txt.
Readme.md: proper table HTML markup.
Update VirtualDub to v1.10.5-test2.