* Fast & efficient updates for ZAMG weather data
ZAMG updates on the hour, so instead of checking every half-hour we can
check each minute - only after the observations are taken until
receiving them.
* sensor.zamg: test instead of whitelist for station_id
* Autodetect closest ZAMG station if not given
* ZAMG weather component, based on the sensor
* Review improvements
* Update to new ZAMG schema, add logging
Turns out it wasn't a typo, but rather an upstream schema change. Added
better error handling to ease diagnosis in case it happens again.
* No hardcoded name
Zac Hatfield Dodds