Tracking geometry more THREAD SAFETY fixes and annotations

Christos Anastopoulosrequested to merge
ATLAS-EGamma/athena:TrkDetDescr_const_cast into master
  • IGeometryProcessor interface and implementations rm un-needed const leading to const_cast
  • This allows a few more things to be marked as SAFE
  • At the same time the TestTools are mostly unsafe, enable the checker and mark them as such

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