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>")

code/game/machinery/computer/buildandrepair.dm

@@ -11,7 +11,7 @@
 				to_chat(user, "<span class='notice'>You start wrenching the frame into place...</span>")
 				if(P.use_tool(src, user, 20, volume=50))
 					to_chat(user, "<span class='notice'>You wrench the frame into place.</span>")
-					anchored = TRUE
+					setAnchored(TRUE)
 					state = 1
 				return
 			if(istype(P, /obj/item/weldingtool))
@@ -30,7 +30,7 @@
 				to_chat(user, "<span class='notice'>You start to unfasten the frame...</span>")
 				if(P.use_tool(src, user, 20, volume=50))
 					to_chat(user, "<span class='notice'>You unfasten the frame.</span>")
-					anchored = FALSE
+					setAnchored(FALSE)
 					state = 0
 				return
 			if(istype(P, /obj/item/circuitboard/computer) && !circuit)