TrigT1NSWSimTools: Fixes for thread-checker

Frank Winklmeierrequested to merge
fwinkl/athena:fwinkl_20200723T110952 into master
  • Use AthMessaging for messaging where applicable.
  • Replace calls to exit with throwing an exception.

One side-effect is that MMLoadVariables is no longer copy-able. But that doesn't seem necessary anyway. Can just be passed by reference.

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