Playlist: add "Open file location" menu item

Fixes #3323
VMROSD: use proper callback function prototype
MainFrm: Prevent XySubFilter from being removed from the graph when cleaning up unconnected filters.

Temporary fix, either offer external subtitles as a pin on the graph or stop cleaning up the graph entirely.

Based on patch by Aleksoid.
Add AfxGetMainFrame() macro
PlayerSeekbar: code refactoring
PlayerSeekbar: smoother mouse seek
PlayerToolbar: be consistent with hand cursor

Previously it changed to arrow on right click
Update VirtualDub to v1.10.4-test11.
player.html: remove width completely.

It's handled in JS.
Update lcms2 to 8928bed.
Webserver: Convert the remaining png files to 8-bit.
Update docs/Compilation.txt for VS2012.
Updated Czech translation
Run astyle.