Set XySubFilter's merit to MERIT_PREFERRED+2, just larger than  InternalScriptRenderer
Refactor: separate auto-loader code from xy_sub_filter code. [Part.1]
Refactor: separate auto-loader code from xy_sub_filter code. [Part.2]
Refactor: separate auto-loader code from xy_sub_filter code. [Part.3]
Compile through
Add IXySubFilterAutoLoaderGraphMutex to prevent XySubFilterAutoLoader/XySubFilterExtraAutoLoader from joining the graph at the same time.
Prevent static MFC code bloat