ITk Pixel module design GMX interface improvements

Tadej Novakrequested to merge
tadej/athena:itk/gmx into master

ITk Pixel module design GMX interface improvements: support both sensor classes and types. Also read the is3D parameter.

This is backwards incompatible so it should be merged as soon as possible as geometry tags have already been updated. Marking urgent.

/cc @nstyles @tlari

Edited by Tadej Novak

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