Merged Shaun Roe requested to merge sroe/athena:22.0-coverity-TrkExUtils into master

Fix coverity 12166: Trk::ParticleMasses.mass can be constexpr variable in namespace Trk::ParticleMasses, no need to instantiate a struct to get the masses. Also used cmath math functions (sqrt -> std::sqrt etc.) This grew; the ParticleMasses are used in many places. Decided to be consistent by adopting the same strategy for ParticleSwitcher, so finally affects many packages with small changes.

Edited by Shaun Roe

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