The coders are able to set the tracer’s colors to anything they want!
Since I use the style background color attribute on the div it can
accept a wide variety of values for the background color.

I first wanted to pass in some color value when calling notify or
select but then I realized there is a lot of issues with the amount of
parameters . So I thought of doing some sort of global set like the
HTML canvas/context does.

Tracer now has 5 new methods for setting the colors.
_Set(name)FillColor(color_goes_here).

The logic of the setting fillColor and it being displayed should be
similar to the canvas/context fillStyle setting. It will keep using
that color until the color is switched again.

I had to change the clear method inside array2d.js also to handle the
new coloring change.