hepmc3 nightly fixes 31012021 part 1
In this MR:
- Migration of codes in
PhysicsAnalysis/D3PDMaker/TruthD3PDMaker
to hepmc3 - Migration of codes in
PhysicsAnalysis/TruthParticleID/McParticleTools
to hepmc3 - New function for AtlasHepMC to copy event but w/o particles and vertices