initial commit - cross reference with 5th port - obviously has compile errors

code/game/objects/effects/forcefields.dm

@@ -0,0 +1,28 @@
+/obj/effect/forcefield
+	desc = "A space wizard's magic wall."
+	name = "FORCEWALL"
+	icon_state = "m_shield"
+	anchored = 1
+	opacity = 0
+	density = 1
+	unacidable = 1
+
+/obj/effect/forcefield/CanAtmosPass(turf/T)
+	return !density
+
+/obj/effect/forcefield/cult
+	desc = "An unholy shield that blocks all attacks."
+	name = "glowing wall"
+	icon_state = "cultshield"
+
+///////////Mimewalls///////////
+
+/obj/effect/forcefield/mime
+	icon_state = "empty"
+	name = "invisible wall"
+	desc = "You have a bad feeling about this."
+	var/timeleft = 300
+
+/obj/effect/forcefield/mime/New()
+	..()
+	QDEL_IN(src, timeleft)