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/machinery/computer/_computer.dm

@@ -111,7 +111,7 @@
 			var/obj/structure/frame/computer/A = new /obj/structure/frame/computer(src.loc)
 			A.dir = dir
 			A.circuit = circuit
-			A.anchored = TRUE
+			A.setAnchored(TRUE)
 			if(stat & BROKEN)
 				if(user)
 					to_chat(user, "<span class='notice'>The broken glass falls out.</span>")