Strict convention for _id, shortid, name attributes

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Currently, we use several attributes like publicKey, key, humanReadableKey on the entity properties. We should remove these and be strict with the name convention, that every entity has _id, shortid, name, (modificationDate) attributes.

[pofider]

I believe only the user has "username" instead of the "name". So I would rename it there. Every other entity should have _id, shortid, name, modificationDate and we can remove all the logic with humanReadableKey....

[pofider]

Ready for v3