* Ensures cores, slimes cannot be used twice in their machines.
* Fixes xenos appearing friendly, simple_mob death problems.
Simple mobs that were dead and not of the hostile subtype wouldn't call walk(src,0), which prevents corpses from following their target.
* Cleans up trait data when a xeno or xeno product is removed.
* Slimes more likely to have amutationtoxin, consumes virusfood.
* Fixes some issues.
* Adds changelog
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