Firmware bug fixes

Pre-compiled hex file below.
Compile with something like:

arduino-cli upload --verbose --fqbn megaTinyCore:megaavr:atxy6:chip=816 \
                               --programmer serialupdi57k --port /dev/tty.usbserial-0001 \
                               --input-file=TouchwheelSAO_attiny816.ino.hex

Back to QFN for ATtiny

After Gio discussion.

Final proto, updated BOM and production files

Final proto boards given to Giovanni (via Kino)

Code on boards given to Giovanni

And simple CircuitPython-based tester w/ display.

v0.1: Boards sent to fab

update bom, for realsies