Migration of GeneratorObjects to HepMC3

In this MR:

• Updates to HepMC3 version of AtlasHepMC package:

  • use id() as barcodes if needed.
  • Added typedef to be able to use raw GenParticle/GenVertex

• Update of HepMCPartiCleLink test to make it compatible with HepMC3.

  • Note the problem with googletest and its overload of operators.
  • A comparison of one line of reference output was moved to the code.

• Added version of constructors with smart pointers for the HepMCParticleLink.

Best regards,

Andrii

Tagging @jchapman

This merge request affects 2 packages:

• Generators/AtlasHepMC
• Generators/GeneratorObjects

added Generators master review-pending-level-1 labels

CI Result SUCCESS (hash 7106409e)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 19161]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 12e51d6b

added sweep:ignore label