hepmc3 nightly fixes 12012021 part 1
In this MR:
- Migration of TruthTrajectoryBuilder.cxx to HepMC3
- Small cleanup in some other files: use std:: explicitly, remove comments, fix formating
Edited by Andrii Verbytskyi
GitLab Registry scheduled maintenance on Wednesday, October 09th 2024 as of 20:00h Geneva time for a period of 1 hour. Further information under https://cern.ch/otg0152540.
In this MR: