AUP3: Removes OD code related to project file handling

This removes all of the OnDemand code embedded throughout
    the main codebase. Individual files related specifically
    to OD have been left in place, but removed from the build.

src/FileFormats.cpp

@@ -320,8 +320,6 @@ static OSType sf_header_mactype(int format)
 
 #endif // __WXMAC__
 
-ODLock libSndFileMutex;
-
 int SFFileCloser::operator() (SNDFILE *sf) const
 {
    auto err = SFCall<int>(sf_close, sf);