Update mhook link.
contrib/rev2hash.sh: remove unused variable.
WebUI: refactor and clean up javascript code.
WebUI: add title in the player's buttons.
WebUI: rename functions and enable strict mode.
WebUI: refactor and tweak styles.
WebUI: switch to `link rel="icon"`.
WebUI: Use a cleaner favicon.ico.
WebUI: show a warning in player.html too if JS is disabled.
WebUI: clean up the `noscript` code.
WebUI: show a warning for IE < 8.

Things don't look good there for some time now.  IE8+ works fine.
WebUI: Add title with the volume level to the volume grip.
Update ZenLib to v0.4.29 r446.
Update MediaInfoLib to v0.7.68.
Move old changelog entries to Changelog_old.txt.
Update Changelog.txt.
Updated LAV Filters to 0.61.2-5-7a393d4 (custom build based on stable version 0.61.2)

Important changes:
 - LAV Splitter: Improved AviSynth support.
 - LAV Video: Decoding H.264 streams with a resolution change using the DXVA2 Copy-Back decoder could crash.
WebUI: Inform the web interface that no audio stream is available.
WebUI: Make use of new [hasaudio] info.
Fix some CPPCheck warnings or mark them as intentional.