MuonCSC_CnvTools: VarHandle migration.

Change CSC_RawDataProviderTool to use a ReadHandle for xAOD::EventInfo rather than a plain SG retrieve of EventInfo. Also some const and other cleanups.

This merge request affects 1 package:

• MuonSpectrometer/MuonCnv/MuonCSC_CnvTools

Adding @rosati ,@wleight as watchers

added MuonSpectrometer master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20809-2019-02-01-10-19
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
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Looks good. Approving.

Clara (L1)

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

merged

mentioned in commit 7b9c7371

added sweep:ignore label