Add HepMC3 support to McParticleTools/HepMc
In this MR:
- added support of HepMC3 to multiple I/O tools in the PhysicsAnalysis/TruthParticleID/McParticleTools directory
- removed junk commented lines
- removed inappropriate line-breaks from 1970s
- used
std::tolower
correctly
Edited by Andrii Verbytskyi