v0.3.0 - Wireless Updating

Starting from this release, we now support wireless updating (aka over-the-air or OTA).
You will need to flash your controller using a new OTA capable UF2, but once that's done you can update your controller using the script nohup ./tools/update_ota.py. It should handle everything for you.

NOTE: If you're SSH-ing into your Klipper Host (you almost certainly are), you must use nohup or an equivalent to keep the task alive whilst it temporarily switches network to upload the update.