Minor Performance Tweaks (#3265)

changes:

/datum/wires no longer has an (init) proc.
SMES wires now use timers instead of spawn.
Cleanables' random_icon_states list is now lazy. (eliminates ~4000 lists from dirt)
/obj/effect can no longer be pushed around by conveyor belts.
Lighting overlays are now explicitly prevented from being moved by conveyor belts.

code/datums/wires/smes.dm

@@ -45,8 +45,7 @@ var/const/SMES_WIRE_FAILSAFES = 16	// Cut to disable failsafes, mend to reenable
 		if(SMES_WIRE_RCON)
 			if(S.RCon)
 				S.RCon = 0
-				spawn(10)
-					S.RCon = 1
+				addtimer(CALLBACK(S, /obj/machinery/power/smes/buildable/.proc/reset_rcon), 10)
 		if(SMES_WIRE_INPUT)
 			S.toggle_input()
 		if(SMES_WIRE_OUTPUT)
@@ -56,5 +55,10 @@ var/const/SMES_WIRE_FAILSAFES = 16	// Cut to disable failsafes, mend to reenable
 		if(SMES_WIRE_FAILSAFES)
 			if(S.safeties_enabled)
 				S.safeties_enabled = 0
-				spawn(10)
-					S.safeties_enabled = 1
+				addtimer(CALLBACK(S, /obj/machinery/power/smes/buildable/.proc/reset_safeties), 10)
+
+/obj/machinery/power/smes/buildable/proc/reset_safeties()
+	safeties_enabled = TRUE
+
+/obj/machinery/power/smes/buildable/proc/reset_rcon()
+	RCon = TRUE

code/datums/wires/wires.dm

@@ -17,8 +17,8 @@ var/list/wireColours = list("red", "blue", "green", "darkred", "orange", "brown"
 	var/wire_count = 0 // Max is 16
 	var/wires_status = 0 // BITFLAG OF WIRES
 
-	var/list/wires = list()
-	var/list/signallers = list()
+	var/list/wires
+	var/list/signallers
 
 	var/table_options = " align='center'"
 	var/row_options1 = " width='80px'"
@@ -27,7 +27,8 @@ var/list/wireColours = list("red", "blue", "green", "darkred", "orange", "brown"
 	var/window_y = 470
 
 /datum/wires/New(var/atom/holder)
-	..()
+	wires = list()
+	signallers = list()
 	src.holder = holder
 	if(!istype(holder, holder_type))
 		CRASH("Our holder is null/the wrong type!")