Port all Sim09 development as from Gauss v49r1 to master

Port to master all development in Sim09 keeping additional development that will be deployed in Sim10, e.g. Pythia8 new version, RICH improvements, FSR for the generators.

Also fix compilation issue for Gaudi v28r1 and LHCb v42r3

This includes:

It includes:

• MR !45 (merged), !53 (merged) (EvtGen)

• MR !28 (merged) (EvtGen, GENSER, toolchain.cmake)

• MR !74 (merged), !80 (merged), (GenCuts)

• MR !81 (merged) (GenCuts, LbCRMC)

• MR !35 (merged) (Generators)

• MR !35 (merged) (Generators, LbCMRC)

• MR !13 (merged), !14 (merged), !42 (merged), !57 (merged), !73 (merged) (LbCRMC)

• MR !72 (merged) (AmpGen)

• MR !52 (merged) (LbAmpGen)

• MR !25 (merged) (LbPythia8)

• MR !58 (merged) (Generators, Gauss, GaussRedecay)

• MR !68 (merged) (MuonMoniSim)

• MR !62 (merged), !63 (merged), !82 (merged) (SimChecks)

• MR !71 (merged) (GaussMonitor)

• Commit 43f1e77d (Gauss)

• Commit fd3f764f (CMakeList.txt)

• MR !75 (merged), !65 (merged), !56 (merged) superseed by later MR