[READY] Multi-Z Openspace visual fixes. (#49323)

* openspace fixes

* os over os fix

* 512 plugs

* up

* up up

* up up up

* drop 512

* drop 512 in obj

* drop 512 in turf

* drop 512 in mob p1

* drop 512 in mob p2

* drop 512 in openspace

* one backdrop to rule all

code/game/objects/objs.dm

@@ -33,6 +33,8 @@
 
 	var/drag_slowdown // Amont of multiplicative slowdown applied if pulled. >1 makes you slower, <1 makes you faster.
 
+	vis_flags = VIS_INHERIT_PLANE //when this be added to vis_contents of something it inherit something.plane, important for visualisation of obj in openspace.
+
 /obj/vv_edit_var(vname, vval)
 	switch(vname)
 		if("anchored")
@@ -72,7 +74,6 @@
 		var/turf/T = loc
 		T.add_blueprints_preround(src)
 
-
 /obj/Destroy(force=FALSE)
 	if(!ismachinery(src))
 		STOP_PROCESSING(SSobj, src) // TODO: Have a processing bitflag to reduce on unnecessary loops through the processing lists