Preparatory changes for the HepMC3 migration for packages in AthSimulation
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This merge request mainly makes the following replacements for classes which are part of the AthSimulation project:
HepMC::GenParticle* --> HepMC::GenParticlePtr
const HepMC::GenParticle* --> HepMC::ConstGenParticlePtr
HepMC::GenVertex* --> HepMC::GenVertexPtr
const HepMC::GenVertex* --> HepMC::ConstGenVertexPtrPlus a few other syntax replacements to use helper functions defined in AtlasHepMC/GenParticle.h and AtlasHepMC/GenVertex.h.
The purpose is to prepare for the migration from HepMC2 to HepMC3. Further syntax changes will be required.