Clean after change room: game scene is cleanly removed from prev room (#416)

addons/escoria-ui-9verbs/game.gd

@@ -39,7 +39,7 @@ onready var pause_menu = $ui/pause_menu
 onready var inventory_ui = $ui/Control/panel_down/VBoxContainer/HBoxContainer\
 		/InventoryMargin/inventory_ui
 
-func _ready():
+func _enter_tree():
 	ProjectSettings.set_setting("escoria/ui/tooltip_follows_mouse", false)
 	escoria.action_manager.connect(
 		"action_finished", 
@@ -47,6 +47,13 @@ func _ready():
 		"_on_action_finished"
 	)
 
+func _exit_tree():
+	escoria.action_manager.disconnect(
+		"action_finished", 
+		self, 
+		"_on_action_finished"
+	)
+
 
 ## BACKGROUND ##