AppSettings: Change default fullscreen hotkeys.

Alt+Enter and F11 are common fullscreen hotkeys for many applications while Ctrl+Enter is not.

Fixes #3075.
Updated Slovak translation.
Compress png files with PNGOut /r.
Update lcms2 to 45034fb
Updated Greek translation.

Refs: #1680.
Move old changelog entries to Changelog_old.txt.
Updated Basque translation (ticket #2890).
Add VS2012 update 3 version number.
Remove the VS2012 update 2 workaround now that update 3 is out.

This reverts da78edb, 8d50410 and 0d6bec3
Audio Switcher: Fix custom channel mapping after 14bc5b28faaf7fe59c9a52d73c237ea47402e8c6.

The output was silent when custom channel mapping was enabled.

This commit fixes #3257.