Move from HepRotation to Transform3D in posXYZHandler

Nicolas Koehlerrequested to merge
nkoehler/athena:agddHandlerEigen into master

Hi,

this MR moves from HepRotation to Transform3D in the AGDD posXYZHandler. The posXYZHandler is the last piece of AGDD which still has CLHEP dependencies. The next MRs will try to remove those.

Best, Nico

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