Merged requested to merge jchapman/athena:ExtraSimSelectorsG4FastCalo_21.0 into 21.0
G4FastCaloTest is the same as
G4FastCalo except that
charged pions below 200 MeV and protons, KLong and K+- below 750 MeV
entering the Calorimeter are handled by Geant4.
This will be used to check the (physics and CPU) performance impact of using Geant4 to simulate these lower energy particles.