Fix constructed directional windows leaking atmos, wrap setting of the anchored var on objects (#38934)

* Wrap setting anchored for structures, fix atmos bug

* forgot this

* Add a signal for setanchored

* move setanchored to obj

* machinery, also some structure stuff

* tabbing

code/game/objects/objs.dm

@@ -31,6 +31,9 @@
 
 /obj/vv_edit_var(vname, vval)
 	switch(vname)
+		if("anchored")
+			setAnchored(vval)
+			return TRUE
 		if("obj_flags")
 			if ((obj_flags & DANGEROUS_POSSESSION) && !(vval & DANGEROUS_POSSESSION))
 				return FALSE
@@ -71,6 +74,10 @@
 	SStgui.close_uis(src)
 	. = ..()
 
+/obj/proc/setAnchored(anchorvalue)
+	SEND_SIGNAL(src, COMSIG_OBJ_SETANCHORED, anchorvalue)
+	anchored = anchorvalue
+
 /obj/throw_at(atom/target, range, speed, mob/thrower, spin=1, diagonals_first = 0, datum/callback/callback)
 	..()
 	if(obj_flags & FROZEN)