Fully implement ST77xx driver

[ikskuh]

This is a common display driver.

There's already some source code there, it's just not finished yet

[mattnite]

@ikskuh could you please summarize what needs to be done so that someone could more easily pick this issue up?

[ikskuh]

I'll do that when we have the basics figured out. I started doing the driver over a year ago and didn't do anything with it except updating the Zig version.

The idea was to basically port the initialization logic of the Arduino drivers here: https://www.arduino.cc/reference/en/libraries/adafruit-st7735-and-st7789-library/

But not copying their code structure, but only the raw command logic