* [Core] Added net7.0 builds (#1635, thanks to @YAJeff).
* [Client] Added support for passing MQTT v5 options (User properties etc.) for disconnects.
* [Client] An internal exception is no longer caught silently when calling _DisconnectAsync_ to indicate that the disconnect is not clean (BREAKING CHANGE).
* [Client] MQTTv5 features are now checked and an exception is thrown if they are used when using protocol version 3.1.1 and lower. These checks can be disabled in client options. (BREAKING CHANGE!).
