Load next step handlers from save file

        :param filename: Filename of the file where handlers was saved
        :param del_file_after_loading: Is passed True, after loading save file will be deleted

def load_next_step_handlers(self, filename="./.handler-saves/step.save", del_file_after_loading=True):
        """
        Load next step handlers from save file

        :param filename: Filename of the file where handlers was saved
        :param del_file_after_loading: Is passed True, after loading save file will be deleted
        """
        self.next_step_saver.load_handlers(filename, del_file_after_loading)