#55 colored backplots

[Fenn Lipkowitz]

it would be super neato if there were a hal pin that i could hook my signal into, and then axis would color the backplot based on the value of the signal. futrher, you could have 3 pins for RGB or HSV or YUV etc.

you could back-plot the following error, or spindle current, or some strain gauge, or feed override. anything you can get into hal somehow.

seems useful for debugging new trajectory planners, since you can visualize velocity and acceleration in 3d space.