Rewriting geometry tool Config to Component accumulator style

Rewriting G4GeometryConfig.py to new style. Here the IDETEnvelope has been rewritten. Also, testing has been added in.

This merge request affects 1 package:

• Simulation/G4Atlas/G4AtlasTools

Adding @jchapman ,@vpascuzz as watchers

added Simulation master review-pending-level-1 labels

CI Result FAILURE

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-21911-2019-03-14-19-11
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 35421]

added NewConfig label

Known test problem, otherwise looks fine, so approving.

Pavol [as L2 MR shifter]

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

merged

mentioned in commit a7536b37

added sweep:ignore label