* Use DataUpdateCoordinator for wemo
* Rename DeviceWrapper->DeviceCoordinator and make it a subclass of DataUpdateCoordinator
* Rename async_update_data->_async_update_data to override base class
* Rename: device -> coordinator
* Wemo: Use the available property instead of returning unavailable from state property
* Nit: s/_insight_device_key/_insight_params_key
* Use insight_params_key for generating unique_id