Merge pull request #10501 from datlo/wizforcewall

Refactor and buff wizard force wall, add greater force wall

code/game/objects/effects/forcefields.dm

@@ -7,6 +7,12 @@
 	opacity = 0
 	density = 1
 	unacidable = 1
+	var/lifetime = 30 SECONDS
+
+/obj/effect/forcefield/New()
+	..()
+	if(lifetime)
+		QDEL_IN(src, lifetime)
 
 /obj/effect/forcefield/CanAtmosPass(turf/T)
 	return !density
@@ -29,12 +35,6 @@
 	icon_state = "empty"
 	name = "invisible wall"
 	desc = "You have a bad feeling about this."
-	var/lifetime = 30 SECONDS
-
-/obj/effect/forcefield/mime/New()
-	..()
-	if(lifetime)
-		QDEL_IN(src, lifetime)
 
 /obj/effect/forcefield/mime/advanced
 	name = "invisible blockade"