Hepmc3 nightly fixes 23112020 part 1

In this MR:

• Use auto and C++11 loops to loop over particles
• Explicit std:: namespace

@jchapman

This merge request affects 10 packages:

• MuonSpectrometer/MuonGeoModelTest
• MuonSpectrometer/MuonValidation/MuonPRDTest
• MuonSpectrometer/MuonValidation/MuonSimHitToPrdTest
• Reconstruction/MissingETPerformance
• Simulation/G4Atlas/G4AtlasTests
• Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimParametrization
• Simulation/TruthJiveXML
• Tracking/TrkTools/TrkTruthToTrack
• Tracking/TrkValidation/TrkValTools
• Tracking/TrkVertexFitter/TrkVertexSeedFinderTools

Affected files list will not be printed in this case

Adding @goetz ,@jchapman ,@rosati ,@pjacka ,@wleight ,@schaarsc ,@xiaozhon ,@amorley ,@ahasib ,@vpascuzz ,@tadej ,@nkoehler ,@mfauccig as watchers

added JetEtmiss MuonSpectrometer Reconstruction Simulation Tracking master review-pending-level-1 labels

CI Result SUCCESS (hash 3a2c05af)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 23890]

code changes are clear, CI passed, approving.

Roman(L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 18281cb3

added sweep:ignore label