* Add power binary_sensor support to Sonos
* Prepare for future unloading of config entries
* Remove unnecessary calls to super() inits
* Add binary_sensor to tests, remove invalid test for empty battery payload
* Move sensor added_to_hass to common sensor class
* Avoid dispatching sensors if no battery
* Use proper attributes property
* Remove power source fallback
* Update homeassistant/components/sonos/speaker.py
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
jjlawren