[CLOSED PR] DMSO - Chem that causes injection on touch with chems

[Caro]

This chem would basically let antags transfer death chems into people's bloodstream instantly, without the delay of pill forcefeeding and without spending the TC on sleepypen.

Perhaps make it care about the reagent volume? So you need at least equal parts of DMSO and other reagents in the mix for it to work