Add color indicator (option) to show components' outputs

[rsnively]

For gates it sounds easy (just make the whole thing red/green based on current state). But there are a couple different ways to tackle components with multiple outputs.

[kepler-5]

As of now, the individual outputs of a component show red or green when they are individually outputting false or true signal, respectively. This obviates the need for "single" circle components, and makes more complex setups easier to read. A more sophisticated solution may be needed... sometime?

[kepler-5]

Purely aesthetically, this also looks ugly at the moment on components that are already tinted red or green (global inputs, or singles).