FEATURE: Video clip playback

[davepl]

This is a juicy feature for anyone up to the task! I have a client side program called videoserver.py that's checked into the samples folder, and the matrix looks really cool playing certain videos, like a fireplace loop.

It woud be nice if we had an effect that played a YouTube video. There are a number of code samplers on Github for playing video, but not sure if anything exists for YouTube specifically.

Short of that goal, being able to play a simple mpeg video file that we embed would also be good.