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.
disable a couple more /analyze warnings for VS2012
Use the variable in the sizeof argument instead of the struct name.
Compress png with PNGOut /r.
Update lcms2 to 45034fb
Updated Greek translation.

Refs: #1680.