remove duplicate definition of CLASS_DEF() in AnalysisBase

Nils Erik Krumnackrequested to merge
krumnack/athena:class_def into master

For historical reasons there were two definitions of the macro CLASS_DEF() in AnalysisBase. There was never a good reason for that and one of them was actually undefining the other one.

Now I consolidated on just one, and switched over all users of the removed one.

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