* Restore state for ZHA OnOff binary sensors
* Let `Motion` extend `Opening`
`Motion` is just a specified version of `Opening` that only changes the device class for some motion sensors.
Since we have more "special code" in the OnOff/Opening sensor now, we also want to make sure that gets applied to `Motion` binary sensors.
* Improve comment and type
* Add test to verify that binary sensors restore last HA state