Standalone T9 Predictive Keyboard

A high-level explainer on how I implemented the T9 functionality.

A few updates:

1. You can now turn any list of words into a library file to be used with the firmware for this project. You can either run it locally, or use the version I have hosted online here.

2. Added "official" support for the Adafruit QT Py RP2040. My macropad is pin compatible with both the QT Py RP2040 and the Pimoroni Tiny 2040. It should work with the SAMD21 based QT Py as well, but I have not tested it. You're gonna want to use external flash if you go that route.

3. I got a bunch of parts in!!! Have a modest supply of PCBs, Key caps, switches, and compatible micro's. More on that  soon.