ISF_Event: const fixes

Frank Winklmeierrequested to merge
fwinkl/athena:isf_event into master

TruthBinding:

  • return ConstGenParticlePtr in getGenerationZeroTruthParticle and getPrimaryTruthParticle
  • remove hand-written copy/assignment methods

ISFTruthIncident:

  • remove position mutable

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