22.0-coverity-TrkExUtils
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