Circuitry code improvements (#18822)

* Remove unncessary spawn from smoke circuit.

* Update to use untyped_list_add for primary circuitry lists

* Add a timer and callback to replace the spawn(0).

* Removed more spawn(0) and not needed callback

code/game/objects/effects/chem/chemsmoke.dm

@@ -138,8 +138,7 @@
 	for(var/i = 0, i < range, i++) //calculate positions for smoke coverage - then spawn smoke
 		var/radius = i * 1.5
 		if(!radius)
-			spawn(0)
-				spawnSmoke(location, I, 1)
+			spawnSmoke(location, I, 1)
 			continue
 
 		var/offset = 0
@@ -157,8 +156,7 @@
 			if(!T)
 				continue
 			if(T in targetTurfs)
-				spawn(0)
-					spawnSmoke(T, I, range)
+				spawnSmoke(T, I, range)
 
 //------------------------------------------
 // Randomizes and spawns the smoke effect.