* Add mysensors binary sensor.
* Add discovery platforms to binary_sensor base component.
* Replace device_state_attributes with state_attributes in
binary_sensor base class.
* Fix docstrings.
* Add discovery of binary sensor to mysensors component.
* Add child.type as argument to mysensors device_class.
* Move binary sensor types from sensor to binary_sensor module.
* Fix binary_sensor attribute tests. Use state_attributes instead of
device_state_attributes.
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