Fix timeseek

This is a4601a7 modified slightly for 3.x
Fixed a log message
Implement WEBVTT subtitles
Remove redundant try block
Revert "Implement WEBVTT subtitles"

This reverts commit 91d9acedd5e756f714dc3c1f29360ef67f9576ab.

Moving it to 4.0.0
Removed duplicate line in renderer conf
Updated changelog
Official release of 3.6.2 for Windows and Linux
Formatting and restore comments lost along the way
Bumped version to 3.6.3
Fix "fix timeseek"
Official release of 3.6.2 (real)