WIP GIZMO entropy switch
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Reimplementation of !816 (closed) on top of the refactored version of Gizmo. !816 (closed) can now be safely closed.
All relevant code from the original merge request has been reimplemented. I still need to run a complete set of hydro tests to make sure this does not break anything. I have not tested yet whether this fixes the issues with the Zeldovich pancake.