Added STGC and MM truth hits in MuonTruthParticlesAux

Edwin Chowrequested to merge
ychow/athena:master into master

Added STGC and MM truth hits in ESD. Some clean up of the MuonTruthDecorationAlg.cxx. Documented in https://its.cern.ch/jira/browse/ATLASRECTS-5356 .

Edited by Edwin Chow

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