Fix renderer crash (no subtitles) in MPC-HC 1.7.7

Demuxer detection: fix overlap when opening FFmpeg-muxed MKV in Aegisub

Hide libass 08092bdfb42abee2c3763b30dcd9905c45f7318e line from Perian

Import version 2016-02-23 into version control

Import version 2016-02-22 into version control

Import version 2016-02-21 into version control

Import version 2016-02-10 into version control

Import version 2014-09-23 into version control