Migrate to HepMC3 BeamEffects
In this MR:
- Migrate to HepMC3 the BeamEffects package.
As suggested by @jchapman , this is quite independent packgae, so the migration of the AthSimulation can be started from it.
In this MR:
As suggested by @jchapman , this is quite independent packgae, so the migration of the AthSimulation can be started from it.