Loading DetDesc/DD4hep simulation attribute files with correct mapping to muon filter volumes
Loading simulation attribute files in Geometry.py for DetDesc (Sim/Gauss/xml/SimulationRICHAerogelOff.xml) and DD4hep (Sim/Gauss/xml/SimulationRICHAerogelOff-dd4hep.xml) using the correct mapping to muon filter volumes.
Includes also the simulation attribute file to produce Muon low energy background samples with DD4hep (Sim/Gauss/xml/MuonLowEnergy-dd4hep.xml).
For DD4hep needs Detector!485 (merged) to be merged. This MR replaces !1041 (closed)