Vast array of changes to replace mutantrace with species datum

code/modules/reagents/Chemistry-Reagents.dm

@@ -1257,7 +1257,7 @@ datum
 					if(ishuman(M))
 						var/mob/living/carbon/human/H = M
 						if(H.dna)
-							if(H.dna.mutantrace == "plant") //plantmen take a LOT of damage
+							if(H.species.flags & IS_PLANT) //plantmen take a LOT of damage
 								H.adjustToxLoss(10)
 
 		plasma
@@ -3463,4 +3463,4 @@ datum
 					else if(data >= 115 && prob(33))
 						M.confused = max(M.confused+15,15)
 					..()
-					return
+					return