Make AthSimulation tests compatible with HepMC3

Andrii Verbytskyirequested to merge
averbyts/athena:AthSimulation_tests_HepMC3_compatibility_part1 into master

Make AthSimulation tests compatible with HepMC3

  • change GenParticle* to GenParticlePtr
  • changed x->barcode() to HepMC::barcode(x)
  • used auto when appropriate (e.g. just extracting an element of vector)
  • new header for AtlasHepMC to compare raw pointer HepMC objects to smart pointers

Tag @jchapman

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