Track selection: Don't override splitter choice if all tracks have the same priority.

Patch based on Kasper93's work.
Properties dialog: List tracks instead of pins when possible.

Splitters often don't output one pin per track so the streams list could be quite incomplete.
Subtitle render: Fix an off-by-one error when painting the overlay.

This error introduced in 3244957f4563575d22bf109de27a703558611b19 could cause artifacts to appear when using karaoke effects.

This commit fixes #2773.
Update SoundTouch to 1.8.0.
Update VirtualDub to v1.10.5-test2.
Use `void` instead of `VOID`.
Enable `/Qpar` compiler option.

Reference  http://msdn.microsoft.com/en-us/library/hh923900.aspx