Abandon package

Closes #395

The ORM can not yet fully operate without the Doctrine Cache interfaces. I think, we should solve that before abandoning the package.

Indeed. We don't want all ORM users to receive a warning from composer about using an abandoned package.

uh oh, was not aware. yeah until current orm runs without this package, it would be a bad idea to do a thing that triggers warnings.

I should have known. Converting to draft until the right moment comes.