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Pass HepMC3::(Const)GenParticlePtr and HepMC3::(Const)GenVertexPtr by reference where possible

Merged John Derek Chapman requested to merge jchapman/athena:GenParticlePtrRefs_master into master

HepMC3::(Const)GenParticlePtr and HepMC3::(Const)GenVertexPtr are implemented as std::shared_ptr so there is a cost associated with adding and removing entries from list of shared_ptrs "owning" and object.