Add RGB codes as an option

[MyristicaFragrans]

An option to show 0-255 RGB codes alongside the hex codes has been added and implemented. This is useful for picking colors for programs that do not accept hex code, in my case Raylib, reducing a conversion step and making color-color easier to use for in these cases.

Because the RGB codes tend to be longer, it was running into the reference color dialogue at smaller resolutions, so I moved it to the bottom-right corner. I also gave the black and white contrast ratios their own lines.

The interface can currently scale to a width of ~1220 pixels before lines start wrapping. A potential solution would be to increase the minimum width of the color palette areas when the RGB codes are shown, though I have not yet found where this is located.