BugFix: should reset m_be_auto_loaded when leave the graph
BugFix: should reset filter info string when disconnect or leave the graph
Functions for dump graph
Add trace graph switcher
Fix new line
BugFix: IDirectVobSub/IXyOptions almost always return S_OK. It causes issues like always auto-load and so on.
Do not auto load embedded subtitle
Use merit normal and NOT register as auto-load subtitle provider
"Away load" should be away load as long as there is no other subtitle filters.
Remove ourself from the graph if no consumer exists
Do not auto-load XySubFilter's merit can not be retrieve OR is set to MERIT_DO_NOT_USE.
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BugFix: load external subtitles Should not failed when no consumer connected, this prevent us from auto-loading with external subtitles