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Definition of xAOD::BaseContainer

Tomasz Bold requested to merge tbold/athena:add-base-xaod-container into 22.0

This MR bring the definition of the xAOD::BaseContainer. That is a container that has no actual content. It allows though to be freely decorates. It turned out that in several areas people abuse other containers for exactly that use-case, see discussion:{5121AF6B-9AFF-4225-8B52-9244D9184E7C}

Tagging people contributing to the discussion: @krumnack @jburr @strichte @mdyndal And core s/w team that will likely be very interested: @akraszna @ssnyder

It was tested in the "full" chain with writing AOD file and reading it back.

Edited by Tomasz Bold

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