Use Eigen instead of CLHEP in AGDD

Nicolas Koehlerrequested to merge
nkoehler/athena:agddClhep into master

Hi,

this MR moves to using Eigen instead of CLHEP in the AGDD packages. The changes were already validated in standalone geometry checks (cf. merge request https://gitlab.cern.ch/GeoModelATLAS/agdd/-/merge_requests/3).

Best, Nico

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