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* Add a `listen()` method to `CTFd.utils.events.EventManager` and `CTFd.utils.events.RedisEventManager`. * This method should implement subscription for a CTFd worker to whatever underlying notification system there is. This should be implemented with gevent or a background thread. * The `subscribe()` method (which used to also implement the functionality of the new `listen()` function) now only handles passing notifications from CTFd to the browser. This should also be implemented with gevent or a background thread. * Pool PubSub connections to Redis behind gevent. This improves the notification system by not having a pubsub connection per browser but instead per CTFd worker. This should reduce the difficulty in deploying the Notification system. * Closes #1622 * Make gevent default in serve.py and add a `--disable-gevent` switch in serve.py * Revert to recommending `serve.py` first in README. `flask run` works but we don't get a lot of control. * Add `tenacity` library for retrying logic * Add `pytest-sugar` for slightly prettier pytest output