Add XySubFilterExtraAutoLoadHelper. It would be compiled into a separated dll. Advanced users can use it for they needs.
Add IXySubFilterAutoLoaderGraphMutex to prevent XySubFilterAutoLoader/XySubFilterExtraAutoLoader from joining the graph at the same time.
Prevent static MFC code bloat
Always use HKEY_CURRENT_USER\Software\Gabest\XySubFilter for reg option