Sync-ed GeoModelXml with the latest updates in the Athena repository

CC @rbianchi @dellacqu

@dellacqu , since we are on it, do you think it makes sense to hide OutputDirector.h in the src directory so that it does not get exposed outside of GeoModelXml, and at the same time clean it from all references to Gaudi?

added 12 commits

• 1271fa23...de3787c6 - 10 commits from branch GeoModelDev:master
• 5acd24ea - Sync-ed GeoModelXml with the latest updates in the Athena repository
• 8e347d09 - Moved OutputDirector.h into GeoModelXml/src and adapted its clients

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added 1 commit

• 0ba873d8 - Moved OutputDirector.h into GeoModelXml/src and adapted its clients

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I don't think that the CI failure is related to my changes. @rbianchi shall we just go ahead and merge this one?

Yes, the CI failed at SoQt step, I guess for a glitch. I'll check that; in the meanwhile, I merge this. Thanks!

mentioned in commit 69c0f6af

merged