Attempt to add color to Auto-Encoder

[kfahn22]

1. I edited the sketch to create magenta stars and blue circles.
2. I have edited the code to push r, g, b values to the raw data array. The auto encoder seems to work, but I am getting an error at line 62 trying to write the new image to output.
   (I originally tried to create animal faces (cat.js, unicorn.js). I got that working, but the output images were kind of sub-optimal so I switched to trying to introduce color instead.)