Fix compilation for HepMC3 and crashes for pythia8
In this MR:
- make codes in CompactHardTruth, MMLoadVariables, etc. HepMC3 compatible.
- add actual run info to pythia8 generation for HEPMC3.
Tag @ewelina
Edited by Andrii Verbytskyi
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In this MR:
Tag @ewelina