Add option to lights for Advanced RGB mode

[Earendel]

If a Friday Facts Post https://www.factorio.com/blog/post/fff-122 about light colours it said how the decision was made to use simple colours for lights:

Other possibilities were sending RGB codes or setting a specific condition for each colour, but I decided for the simple option.

With the most recent update you can open up the light configuration, it's a really convenient place to have an option to switch a light between different colour modes.

What I'd like is to have the ability to switch a light from 'Basic Colours' where 1 red means the light is fully red, to 'Advanced RGB' where 1 red means the red is 1/255 the of full red value.

So for example: 255 red, 255 green, 255 blue would be white.

This way we could have full RGB displays and do things like a gradual transition from green to red on accumulator energy light displays, etc.