p5js/scales - random_colors - Add concept of mode
p5js/scales - random_colors - Add concept of mode

* Intent is to allow for toggling between "random" mode (which is what has already been implemented). and a 'scales' mode where the intensities of the colors is along a gradient.

brianhonohan/sketchbook,brianhonohan/sketchbook,brianhonohan/sketchbook