ISF_FastCaloSimEvent: thread-checker fixes

Frank Winklmeierrequested to merge
fwinkl/athena:isfcalosim into master

Various changes to make the code pass the thread-checker:

  • Make the garbage collector (DoCleanup) thread-safe.
  • TFCSParametrizationBase: use thread-specific MsgStream for logging
  • minor const fixes
  • mark code using gRandom as not thread-safe as it's only used for testing or entirely unused
Edited by Frank Winklmeier

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