Server now sends velocity data to the client

The client does not do anything with the data, currently, but it is
useful for bots ;)
Should probably try to keep this `r` from "floating" to some incredibly useless precision. Just round it to desired precision or wrap it in `parseInt()` to trunc it. Also.. "R"? This is an angle. you should probably use `a` for "angle", or `t` for theta, or perhaps even `d` for direction (though that's current;y in use to depict where the ship is facing).