src\thirdparty\LAVFilters\build_lavfilters.bat: Keep the style consistent.
installer: reindent and remove commented code.
Batch files: Don't initialize empty variable.

This commit fixes build scripts on Windows XP.
Run AStyle.
Shave off a few more bytes from png files.
VSFilter: Rebrand all strings from DirectVobSub to VSFilter.
Add Windows 8.1 ID in the manifest files.
Audio Switcher: Exhibit all audio tracks available.

The "Play > Audio" menu now includes all the embedded tracks exhibited by the source filter and the external tracks.
Improve the infinite recursion detection when parsing playlists.

The parser was sometimes too strict and rejected valid playlists.