PGS/DVB subs: Enable auto-fit logic only for HD contents.

SD contents are often anamorphic and thus break the auto-fit logic. Auto-fit is mostly useful for HD subtitles used on cropped or resized video anyway.
Fix: PGS subtitle timings were sometimes wrong.

Some PGS subtitles started or ended too late.

Subtitles should be queued before we know when they really end because the next subtitle can come much later in the stream.

This commit fixes #3691.
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.