Readds borers (#1999)

Readds the cortical borers and also syndi-borers.
Syndi-borers now gives a response if you try to use it multiple times
too quickly, and also prevents usage more than once while it's still
waiting for ghost responses.

code/datums/mutations.dm

@@ -377,6 +377,9 @@ GLOBAL_LIST_EMPTY(mutations_list)
 	time_coeff = 2
 
 /datum/mutation/human/race/on_acquiring(mob/living/carbon/human/owner)
+	if(owner.has_brain_worms())
+		to_chat(owner, "<span class='warning'>You feel something strongly clinging to your humanity!</span>")
+		return
 	if(..())
 		return
 	. = owner.monkeyize(TR_KEEPITEMS | TR_KEEPIMPLANTS | TR_KEEPORGANS | TR_KEEPDAMAGE | TR_KEEPVIRUS | TR_KEEPSE)