ASS/SSA subtitles: Fix a possible infinite loop during parsing.

The wrong loop index was incremented after a typo in 21298a3d04befa61f59e0f063a019f748f54af55.

This commit fixes #4173.
Shaders option page: the buttons' icons were missing on Windows XP.

This commit fixes #4163.
Lite builds: Fix a minor inconsistency regarding the output directory.

Lite debug builds use "mpc-hc_x??_Debug Lite" while release builds always used "mpc-hc_x??" for both normal and lite builds.
Fix: x86 and x64 versions conflicted over file associations.

4f465cf8b81f1da800b1bfc57cc48e317d24fbb5 was incomplete for Vista+.

This commit fixes #4064.
Language menu: Ensure "Language" always appears in English in menu entry.

If "Language" doesn't appear in the translated string, "(Language)" will be appended automatically.