Bit more cleanup

scripts/Singleton/UI.gd

@@ -1,25 +1,5 @@
 class_name UISystem extends Control
 
-enum Layer {
-	Game,
-	VN,
-	Test,
-	Debug
-}
-
-func addSubscene(subscene:Control, layer:Layer) -> void:
-	subscene.originalParent.remove_child.call_deferred(subscene)
-
-	match layer:
-		Layer.Game:
-			$LayerGame.add_child.call_deferred(subscene)
-		Layer.Debug:
-			$LayerDebug.add_child.call_deferred(subscene)
-		Layer.VN:
-			$LayerVN.add_child.call_deferred(subscene)
-		_:
-			push_error("Invalid layer: " + str(layer))
-			return
-
-func removeSubscene(subscene:Control) -> void:
-	subscene.get_parent().remove_child(subscene)
+func _process(delta: float) -> void:
+	# This needs to always be at the end of the parent node's tree
+	get_parent().move_child(self, get_parent().get_child_count() - 1)