ISF_Event: const fixes for Truth

Frank Winklmeierrequested to merge
fwinkl/athena:isftruth into master

Provide const-correct accessors for:

  • ITruthIncident::parentParticle()
  • TruthBinding::getTruthParticle()

Tested also in HepMC3 build.

Edited by Frank Winklmeier

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