* Add unique_id property
After HA 0.111 the ARWN platform's lack of a unique_id causes the
sensors to fail to register correctly. The unique_id for this is just
a slug which is the mqtt topic that it's inbound on.
Also change the logging to INFO for data received to make it fit
better in the logging levels and show up during '-v' runs.
* use topic as unique_id
fix logging
* fix final topic location
* fix black
* address the fact that some topics have more than one sensor
This splits up rain and wind sensors to unique topics
* address review comments
2a576e979b