gd: added menu template

menus/scripts/level_list_and_state_manager.gd

@@ -0,0 +1,14 @@
+extends LevelListManager
+
+func set_current_level_id(value : int) -> void:
+	super.set_current_level_id(value)
+	GameState.level_reached(value)
+
+func get_current_level_id() -> int:
+	current_level_id = GameState.get_current_level() if force_level == -1 else force_level
+	return current_level_id
+
+func _advance_level() -> bool:
+	var _advanced := super._advance_level()
+	GameState.set_current_level(current_level_id)
+	return _advanced