Secure Airlock update!

4 new wires, completely randomised! (2nd bolt wire, 2 only-drop-bolts wires, and an AI alert wire that alerts an AI 20% of the time, when messed with)
Emags have a limited number of uses, between 3 and 7, and cost 5 TC
Hacktools are more useful than they were, and have a lower chance of alerting the AI
(This is unmapped ATM)

code/modules/mob/living/silicon/robot/robot.dm

@@ -421,6 +421,11 @@
 				user << "\red Access denied."
 
 	else if(istype(W, /obj/item/weapon/card/emag))		// trying to unlock with an emag card
+		var/obj/item/weapon/card/emag/E = W
+		if(E.uses)
+			E.uses--
+		else
+			return
 		if(!opened)//Cover is closed
 			if(locked)
 				if(prob(90))