v0.1.0 - PKE8721DAF (AmebaDplus)

First official firmware release, targeting PKE8721DAF. The full
micropython/tests hardware regression suite has been run on PKE8721DAF;
see the Roadmap in the repo for completed items.

Flashing

If you don't want to set up the full SDK toolchain, you can flash with
Realtek's standalone tools -- see the
README flashing
instructions.

Known limitations

• TLS connections do not check certificate validity (expired/not-yet-valid
  certificates are silently accepted).
• machine.UART's IRQ_TXIDLE/IRQ_RXIDLE never fire (architectural gap).
• network.WLAN AP mode fails with mixed WPA/WPA2 authentication; plain
  WPA2 works fine.
• machine.Encoder/machine.CAN are not implemented on PKE8721DAF
  (no hardware support).

This release has only been fully hardware-tested on PKE8721DAF.