Simple graphics library

Will draw Adafruit GFX compatible fonts, lines, squares, and it will also fill a square. It can draw or clear any of these. That's it, graphics as God intended.

Made for ST7920 with my own driver library, but it should be pretty universal, it just needs draw and clear functions taking x,y coords of a pixel + some user context.

Idk why I added a readme, it's pretty self documenting. Maybe i'll break this into it's own git repo and add it as submodule, along with the disp driver.