Req: Ability to change default DMG palette

[Anapan8]

The built in palette for monochrome DMG games is kind-of washed out no matter the brightness. Could someone add in the ability to adjust the 16 colors for BG, OBJ1, OBJ2 and Window (to be saved into the save-state), or the ability to load an external palette file if present (maybe in NO$GMB 48-byte .RGB format to make editing it easier)?