Support for SAMD21 (Arduino MKR1010)

[NeverFinished]

We are using these boards for our university courses - plenty of them are available. Combined with the Arduino MKR carrier, it gives a nice all-in-one IoT Node (lots of sensors, relays, output...).

The microcontroller board itself uses a WiFiNINA chip for wireless connection.

It would be great to support this board as node type. OTA should be possible as well.