Device Registry (#15980)

* First draft

* Generate device id

* No obscure registry

* Dont store config_entry_id in device

* Storage

* Small mistake on rebase

* Do storage more like entity registry

* Improve device identification

* Add tests

* Remove deconz device support from PR

* Fix hound comments, voff!

* Fix comments and clean up

* Fix proper indentation

* Fix pydoc issues

* Fix mochad component to not use self.device

* Fix mochad light platform to not use self.device

* Fix TankUtilitySensor to not use self.device

* Fix Soundtouch to not use self.device

* Fix Plex to not use self.device

* Fix Emby to not use self.device

* Fix Heatmiser to not use self.device

* Fix Wemo lights to not use self.device

* Fix Lifx to not use self.device

* Fix Radiotherm to not use self.device

* Fix Juicenet to not use self.device

* Fix Qwikswitch to not use self.device

* Fix Xiaomi miio to not use self.device

* Fix Nest to not use self.device

* Fix Tellduslive to not use self.device

* Fix Knx to not use self.device

* Clean up a small mistake in soundtouch

* Fix comment from Ballob

* Fix bad indentation

* Fix indentatin

* Lint

* Remove unused variable

* Lint

homeassistant/components/binary_sensor/nest.py

@@ -130,7 +130,7 @@ class NestBinarySensor(NestSensorDevice, BinarySensorDevice):
 
     def update(self):
         """Retrieve latest state."""
-        value = getattr(self.device, self.variable)
+        value = getattr(self._device, self.variable)
         if self.variable in STRUCTURE_BINARY_TYPES:
             self._state = bool(STRUCTURE_BINARY_STATE_MAP
                                [self.variable].get(value))
@@ -154,4 +154,5 @@ class NestActivityZoneSensor(NestBinarySensor):
 
     def update(self):
         """Retrieve latest state."""
-        self._state = self.device.has_ongoing_motion_in_zone(self.zone.zone_id)
+        self._state = self._device.has_ongoing_motion_in_zone(
+            self.zone.zone_id)