G4HitFilter → MuonSpectrometer Relation

File in Simulation/G4Extensions/G4HitFilter	Includes file in MuonSpectrometer
src / G4HitFilter.cxx	MuonSimEvent / MuonSimEvent / CSCSimHitCollection.h
src / G4HitFilter.cxx	MuonSimEvent / MuonSimEvent / MDTSimHitCollection.h
src / G4HitFilter.cxx	MuonSimEvent / MuonSimEvent / RPCSimHitCollection.h
src / G4HitFilter.cxx	MuonSimEvent / MuonSimEvent / TGCSimHitCollection.h