color type comment
drawPixel with interleaved color
ColorI - convert color to interleaved color
Use internal color to speed up line draw, rectangle draw (adapt from AdafruitGFX)
ColorI - faster conversion to interleaved color
COLORI_DRAW - control use of interleaved color speedup, comment explaining use
ColorI - draft version for 5 bit color
Minimum row time - results testing when actually fails