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/modules/mob/living/brain/brain_item.dm

@@ -46,6 +46,10 @@
 
 /obj/item/organ/brain/Remove(mob/living/carbon/C, special = 0)
 	..()
+	if(!special)
+		if(C.has_brain_worms())
+			var/mob/living/simple_animal/borer/B = C.has_brain_worms()
+			B.leave_victim() //Should remove borer if the brain is removed - RR
 	if(!gc_destroyed || (owner && !owner.gc_destroyed))
 		transfer_identity(C)
 	C.update_hair()