Add extra third party upload options for AirLink device

[dhover]

In Germany there is a big project https://sensor.community/ which collects data of particulate matter sensors. Maybe it's a good idea if it is possible to upload the sensor data of airlink devices in CumulusMX to those api's.
A few uploads would be nice to have, e.g. sensor.community (formerly luftdaten.info), madavi and opensensemap.
More info about the api's can be found on the page: https://hmmbob.tweakblogs.net/blog/cat/3795sensor community api
And here are the official ones: https://github.com/opendata-stuttgart/meta/wiki/APIs