GIMP Palette
Name: HW CGA (4-color modes)
Columns: 4
# https://en.wikipedia.org/wiki/List_of_8-bit_computer_hardware_palettes#CGA
  0   0   0	Mode 4, palette 1, low intensity
  0 170 170	1 - cyan
170   0 170	2 - magenta
170 170 170	3 - light gray
  0   0   0	Mode 4, palette 1, high intensity
 85 255 255	1 - bright cyan
255  85 255	2 - bright magenta
255 255 255	3 - white
  0   0   0	Mode 4, palette 2, low intensity
  0 170   0	1 - green
170   0   0	2 - red
170  85   0	3 - brown
  0   0   0	Mode 4, palette 2, high intensity
 85 255  85	1 - bright green
255  85  85	2 - bright red
255 255  85	3 - yellow
  0   0   0	Mode 5, low intensity
  0 170 170	1 - cyan
170   0   0	2 - red
170 170 170	3 - light gray
  0   0   0	Mode 5, high intensity
 85 255 255	1 - bright cyan
255  85  85	2 - bright red
255 255 255	3 - white
  0   0   0	Mode 5, monochrome monitor
170 170 170	1 - light gray
 85  85  85	2 - dark gray
255 255 255	3 - white