Replace queue_free() call with sth more robust

src/core.gd

@@ -98,7 +98,9 @@ func _init(new_config: CoreConfiguration = CoreConfiguration.new()) -> void:
 	var inittime: int = Time.get_ticks_msec()
 	name = "CORE"
 	if !check_godot_version(): return
-	if !determine_basepath(): queue_free()
+	if !determine_basepath():
+		get_tree().quit(70)
+		while true: await get_tree().create_timer(9999).timeout
 	custom_modules_node = Node.new()
 	reload_configuration(new_config)
 	initialize_modules()