* Refactor mysensors callback and add validation
* Add mysensors entity class. The mysensors entity class inherits from
a more general mysensors device class.
* Extract mysensors name function.
* Add setup_mysensors_platform for mysensors platforms.
* Add mysensors const schemas.
* Update mysensors callback and add child validation.
* Remove gateway wrapper class.
* Add better logging for mysensors callback.
* Add discover_persistent_devices function.
* Remove discovery in mysensors component setup.
* Clean up gateway storage in hass.data.
* Update all mysensors platforms.
* Add repr for MySensorsNotificationDevice.
* Fix bug in mysensors climate target temperatures.
* Clean up platforms. Child validation simplifies assumptions in
platforms.
* Remove not needed try except statements. All messages are validated
already in pymysensors.
* Clean up logging.
* Add timer debug logging if callback is slow.
* Upgrade pymysensors to 0.11.0.
* Make dispatch callback async
* Pass tuple device_args and optional add_devices
* Also return new_devices as list instead of dictionary.
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