Add Flickery-ness

[TravisBumgarner]

https://media1.giphy.com/media/26ufnw7I96fRGTYFq/giphy.gif?cid=3640f6095c0ebbf561546f5759714ae4

[tenth10th]

When a message isn't coming through, the lights could "flicker" (fade on and off quickly, in random durations). To avoid an obvious "rippling effect", we could also simply turn them all on (and then off) in random order, with (very small) random delays between each light action.

(That might be visually distracting / annoying when there isn't a message coming in - They could just all be on, or slowly fade alternating lights on and off, more like standard holiday light behavior.)

[tenth10th]

(For example, we could store a list of the integers [0 ... 26] and random.shuffle() it each time we want to turn lights on and off, rather than always activating / deactivating them in order.)

[TravisBumgarner]

Random exploration we did into this:

def flicker():
    flicker_duration = 100/1000
    while True:
        FLICKER_THRESHOLD = 990
        flicker_chance = random.randint(0,1000)
        if flicker_chance > FLICKER_THRESHOLD:
            flicker_value = random.randint(0,255)
            flicker_duration = random.randint(0,50)
            pixels[0] = (255,255,255, flicker_value)
        else:
            pixels[0] = OFF
        time.sleep(flicker_duration / 1000)