run astyle
Improve contrib/sign.bat.

Check if Visual Studio is installed.
Changelog.txt: fix typo
mpcresources/rcfile.pl: fix typo in comment.
contrib/sign.bat: revert the ENDLOCAL change after 36538f833f990e43f3a0e7758de1bb74c04056cd
Make "Sharpen Complex 2" shader compatible with Pixel Shader 2.0.

This commit fixes #3008.
MediaFormats: RAR was incorrectly flagged as audio-only.