Hepmc3 nightly fixes 14122020 part 1
In this MR:
- Update types
GenParticle*
toGenParticlePtr
and similar - use std:: for math functions
- Use C++11 loops for hepmc3 compatibility
Edited by Andrii Verbytskyi
In this MR:
GenParticle*
to GenParticlePtr
and similar