Investigate using the st7789py_mpy driver

[foopod]

Background

This repo is based around using a specific version of MicroPython because it has a version of a st7789 driver written in C that performs better than its Python counter part (by a factor of 10).

Job

This ticket on the st7789py_mpy repo suggests that we can get similar performance with the MicroPython driver by using hardware SPI. Let's make a demo/test to investigate if this is possible and how the performance differs between the drivers.

1. st7789py_mpy -> https://github.com/russhughes/st7789py_mpy
2. s3LCD -> https://github.com/russhughes/s3lcd

Use the Tiny Toaster or similar example from either repo and compare frame-rate across both.

Why

Using this driver would allow us to bundle it with the app, thereby letting users run it under any version of MicroPython rather than needed to flash the specific version listed in our Readme.