BugFix: property page should not have its own OK/Cancel button
Bugfix: should call CPropertyPage's OnOK
BugFix: RGB output level a) failed to switch to PC when our option is prefer_TV and the consumer change it's preference from prefer_TV/NO to prefer_PC/PC; b) we don't support change RGB output level of image based subtitle, should always report PC.
Support external SUP subtitle file [PART 1] Refactor to reuse part of the code
Support external SUP subtitle file [PART 2] Add SupFileSubtitleProvider to handle SUP subtitle file
Fix comment
Add YUV and RGB level options to UI