Feature request: Mark known devices as away (when they’re away) when restarting the addon

[ShonP40]

At the moment, if I restart the integration while a device isn’t in range of my nodes, the integration wont update its MQTT entity to away, nor even keep displaying it on the devices tab.

It’d be nice to have the integration update each MQTT entity to away if it hasn’t been seen by the integration after startup.

Also, I’ve noticed that sometimes some devices become stuck & keep reporting as being in a specific room even when they’re not in Bluetooth range anymore.