AthenaAuditors: Migrate auditor hooks

Frank Winklmeierrequested to merge
fwinkl/athena:auditors into master

The before/after[XYZ] (e.g. beforeInitialize/afterInitialize) auditor hooks are deprecated. Migrate the code in those hooks to the generic before/after hooks. There should be no functional changes in the code.

Also delete the unused CoWAuditor.

Edited by Frank Winklmeier

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