Fixed Muon DD4hep VolumeID and added decoding class
Fixed the DD4hep VolumeID in the Detector description and added the MuonVolumeID decoding class that returns the same values as the DeMuon sensitiveVolumeID()
Edited by Ben Couturier
Fixed the DD4hep VolumeID in the Detector description and added the MuonVolumeID decoding class that returns the same values as the DeMuon sensitiveVolumeID()