Non-blocking sockets causing problems

[pbogre]

Non-blocking sockets are alright and from what I've tested they make the game a lot smoother with no jittering of the ball, but it can lead to desync in the game. A possible reason for this might be that when the ball "respawns" in the middle, I haven't handled that in the code so the two clients become desynced.

For now, the last working commit was "improved movement"