Preparatory changes for the HepMC3 migration for packages in AthSimulation

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::ConstGenVertexPtr

Plus 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.

Simulation/BeamEffects/src/GenEventBeamEffectBooster.h

@@ -57,7 +57,7 @@ namespace Simulation {
     /** calculate the transformations that we want to apply to the particles in the current GenEvent */
     StatusCode initializeGenEvent(CLHEP::HepLorentzRotation& transform) const;
     /** apply boost to individual GenParticles */
-    void boostParticle(HepMC::GenParticlePtr  p, const CLHEP::HepLorentzRotation& transform) const;
+    void boostParticle(HepMC::GenParticlePtr p, const CLHEP::HepLorentzRotation& transform) const;
 
     ServiceHandle<IAthRNGSvc>       m_rndGenSvc;
     ATHRNG::RNGWrapper*             m_randomEngine;             //!< Slot-local RNG