New G4 Physics Lists to be used in Sim10
Add new physics list to change EM to use Opt2 as provided to us by G4 (identical to what set by default in Gauss v54r3 (MR lhcb/Gauss!615 (merged)).
Also add the same for the case when switching off the LHCb physics process for the RICH to allow for RICHless and TrackerOnly productions.