BugFix: HDMV/DVBSub corruption
Untabify.
Subtitles: Make both DVD subtitles show in case of overlap

Makes behavior consistent with VLC and mplayer/libavcodec DVD
subtitle implementations. Sets the StopTime of the subtitle
before the same as the StartTime of the currently added DVD
subtitle.

Backport of MPC-HC commit f478e57
Fix several signed/unsigned missed match warnings
Bugfix: properly support loading options
Quit the graph when we should not auto load.