Replace the colour coded RGB button with something colour blind friendly

[mentarus]

The single RGB button was a great idea for a simple interface but it makes it impossible to distinguish the state of the machine for some colour-blind maintainers. I don't think there's an "easy" solution for this, maybe adding a simple LCD screen should be considered?

[russss]

A cheap LCD is going to be equally inaccessible to those with bad eyesight. Do we have someone who's red-blue colour-blind?

[mentarus]

red-green actually

[russss]

OK, I think we could sort it out with a software tweak. I'll give it a think.

[JasperWallace]

I'm happy to run some tests with different colours to find ones that can be distinguished