FastCaloSim: Making FastShowerCellBuilderTool const.

TH1::GetRandom() and TH2::GetRandom2() are not MT-safe, since they're non-const and also use gRandom. These are used from ParticleEnergyParametrization. Rewrite so as to be const and to allow passing in a random generator rather than having to use gRandom. (We currently still pass in gRandom. Changing that would change rng seeding, so that will be fixed in a subsequent change.)

This merge request affects 1 package:

• Simulation/FastShower/FastCaloSim

Adding @jchapman ,@vpascuzz as watchers

added Simulation master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20534-2019-01-23-01-05
Athena: number of compilation errors 0, warnings 6
AthSimulation: number of compilation errors 0, warnings 0
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mentioned in commit b0bcf847

merged

added sweep:ignore label