Waits for a scene to be loaded based on is_loaded.
    :param cli:
    :param scene_name:
    :param is_loaded: Whether or not to await for loaded state (True | False)
    :param timeout_seconds: How long until this returns with failure
    :return: bool

def await_scene_loaded(cli, scene_name, is_loaded=DEFAULT_SCENE_LOADED, timeout_seconds=DEFAULT_TIMEOUT_SECONDS):
    """
    Waits for a scene to be loaded based on is_loaded.
    :param cli:
    :param scene_name:
    :param is_loaded: Whether or not to await for loaded state (True | False)
    :param timeout_seconds: How long until this returns with failure
    :return: bool
    """
    message_payload = {
        "scene_name": scene_name,
        "is_loaded": is_loaded,
        "timeout": timeout_seconds
    }
    msg = message.Message("await.unity.scene.loaded", message_payload)
    cli.send_message(msg)

    response = cli.read_message()
    verify_response(response)
    return bool(response['payload']['success'])