Support colorblind accessibility

[EdenEast]

I believe accessability something that is very important. As a colorscheme, nightfox should be accessible to people with color blindness.

To this end nightfox should change its colors based on someone's type of color blindness. By setting the type of color blindness in the config settings nightfox's pallet should reflect colors / shades that are distinct.

This is a long term goal of nightfox and I am not sure the best way of implementing this. I also need to research and understand more about color blindness and how to best change colors to reflect the different types.

[sultanahamer]

I am a moderate deutan, I can help you test. When I try to play a game seriously(for longer time) I would check if it has color blind mode and enable it.

https://enchroma.com/pages/moderate-deutan-test-result