Add stem_backend.dll to the stemkit build, to break the bluetooth.dll dependency

Start breaking the dependency of backend.dll on bluetooth.dll - commit copies of the original ossrv files from PDK 3.0.2

Update filter_obyfile.pl to support the "In" command, which detects conflicts with the scope of removals Updated rom_content.csv to mark backend.dll, libwfcsyborg.dll and QtCore.dll as "In", because we must have them.