build.bat: Fix default compiler in help screen.
LAVFilters/build_lavfilters.bat: use VS2012 by default.
contrib/astyle.ini: Remove obsolete directory.
Use an empty line after #pragma once directives.
Remove icl13.diff.
AboutDlg: "Compiler" was written with upper case for FFmpeg and lower case for MPC-HC when copying to clipboard, make it consistent.
Add sign support for the VSFilter installer.
Rename "MPC-HC" compiler to "Compiler".

The previous text was misleading after the LAVFilters addition since LAVFilters are built with the same compiler as MPC-HC is.
Optimize sign support for the VSFilter installer.
DeCSS/VobFile.cpp: be consistent with the defines.
Add /d2Zi+ to enable proper debugging of optimized code (i.e. Release builds).

https://randomascii.wordpress.com/2013/09/11/debugging-optimized-codenew-in-visual-studio-2012/
PPageAudioSwitcher: Don't keep refs to graph objects.

Fixes #3300.
PlayerPlaylistBar: Group "Move to Recycle Bin" with other file management options.