Add two new light shows to the show choices. "retro" and "white"

Add two new shows to the light shows. (remember that there may be some magic number 9's floating around to wrap the show type around) Not sure if there are any more to fix.

Light show #1 can be retro lights (for now the color could be 0,15,0
Light show #2 can be white lights (for now the color could be 10,10,10

I suggest that you define some global constant that you can initialize in setup() with the values.

uint32_t retro_color;

setup() {
retro_color = pixels.Color(0,15,0);
}