Fixed a very minor bug in networking

Minor if you consider blocking minor. Which you shouldn’t, blocking is
bad. Master node plays a frame while the clients are rendering, and no
longer waiting for the ack to play a frame
More Documentation

I lied about the other commit being my last commit. This one is now my
last commit. I figured I needed to document the most interesting part
of this program, the networking, as it’s pretty neat but needs a little
explanation.