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2/3-color Panels with 4 Bits per Pixel (BBEP_4BPP_DATA flag) broken in OpenDisplay #163

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@neffs

I have a GDEW0583C64 5,83" BWY display which is supported by bb_epaper. OpenDisplay toolbox lists it as 37 EP583R_600x448.

This display is a bit weird, because it expects 4 bit per pixel, instead of 2. Specification

Within bb_epaper, there is a flag BBEP_4BPP_DATA for displays like these, used by 2 3-color and one 2-color display.

Unfortunately OpenDisplay seems to create its own datastream and circumvents the bb_epaper code handling this case.
With color scheme bwy selected, OpenDisplay sends 2 bit per Pixel, instead of 4. I got black/white working by selecting bwgbry as color, but it seems hacky and I still don't see yellow.

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