Obsolete the PROXMOVE flag and uses

code/modules/assembly/proximity.dm

@@ -4,7 +4,6 @@
 	icon_state = "prox"
 	origin_tech = list(TECH_MAGNET = 1)
 	matter = list(DEFAULT_WALL_MATERIAL = 800, "glass" = 200, "waste" = 50)
-	flags = PROXMOVE
 	wires = WIRE_PULSE
 
 	secured = 0
@@ -33,7 +32,7 @@
 	update_icon()
 	return secured
 
-/obj/item/device/assembly/prox_sensor/HasProximity(atom/movable/AM as mob|obj)
+/obj/item/device/assembly/prox_sensor/HasProximity(turf/T, atom/movable/AM, old_loc)
 	if(!istype(AM))
 		log_debug("DEBUG: HasProximity called with [AM] on [src] ([usr]).")
 		return
@@ -90,6 +89,10 @@
 
 /obj/item/device/assembly/prox_sensor/Moved(atom/old_loc, direction, forced = FALSE)
 	. = ..()
+	if(isturf(old_loc))
+		unsense_proximity(range = range, callback = .HasProximity, center = old_loc)
+	if(isturf(loc))
+		sense_proximity(range = range, callback = .HasProximity)
 	sense()
 
 /obj/item/device/assembly/prox_sensor/interact(mob/user as mob)//TODO: Change this to the wires thingy