* Fixes plasmamen burning to death in cloning pods
Fixes#25921.
🆑 coiax
fix: Plasmamen no longer burn to death while inside a cloning pod.
/🆑
In my big cloning overhaul, I made the choice to have clones not
interact with the external gases, because they were immersed in
pressurised liquid, with their oxygen needs being taken care of by the
"brine". This was a declared feature of the cloning PR.
Evidently, I must have removed it at some point. So I'm fixing that.
* converts space gas mixtures to immutable gas mixtures
* renames space_mixture.dm
* adds immutable gas mix for cloners
* updates the repo dme
* updates keyword according to new guidelines
coiax
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