Refactored gibbing and slipping for carbon mobs, entirely removed mutantrace var. This commit is only partial, following commits are contiguous to it (lol this is atomic right)

code/modules/awaymissions/corpse.dm

@@ -23,14 +23,14 @@
 	var/corpseidjob = null // Needs to be in quotes, such as "Clown" or "Chef." This just determines what the ID reads as, not their access
 	var/corpseidaccess = null //This is for access. See access.dm for which jobs give what access. Again, put in quotes. Use "Captain" if you want it to be all access.
 	var/corpseidicon = null //For setting it to be a gold, silver, centcomm etc ID
-	var/mutantrace = "human"
+	var/species = "Human"
 
 /obj/effect/landmark/corpse/initialize()
 	createCorpse()
 
 /obj/effect/landmark/corpse/proc/createCorpse() //Creates a mob and checks for gear in each slot before attempting to equip it.
 	var/mob/living/carbon/human/M = new /mob/living/carbon/human (src.loc)
-	M.dna.mutantrace = mutantrace
+	M.set_species(species)
 	M.real_name = src.name
 	M.death(1) //Kills the new mob
 	if(src.corpseuniform)