TrigMonitoring: Package cleanup

Frank Winklmeierrequested to merge
fwinkl/athena:cmake_trigger15 into master

Cleanup TrigJetMonitoring, TrigMinBiasMonitoring, TrigBphysMonitoring, TrigBjetMonitoring:

  • delete obsolete files
  • enable flake8 and fix code
  • cleanup cmake configuration
  • move private headers to src directory

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