Uint8Array over SPI

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Raik
but that transmission follows the update of the display cell by cell with looking up the waveform and pushing it out

Actually, you can (should?) set the waveform on initialization of the display. I guess it is then stored on the chip. In the SSD1606 implementation it is done the same way.
For updating the paper after tranferring the pixel data, you just send one command with no data. In my case it would be
```
DISPLAY_REFRESH:0x12
```

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