Add ATLAS_CHECK_THREAD_SAFETY to CaloTools

Christos Anastopoulosrequested to merge
ATLAS-EGamma/athena:Calo_ATLAS_THREAD_SAFE_2 into master

Adds ATLAS_CHECK_THREAD_SAFETY to CaloTools

  • static to static const (including pointer i.e static var const * const
  • Registering callbacks with regFcn can not be thread safe

Also fixed a typo in 2 comments in CaloUtils from a previous MR.

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