Sign on process:

New client
client		server
		HELO
SIGNUP
		PLAYER_CODE
		
Existing client
client		server
		HELO
LOGIN
		LOGIN_OK
		
Expired login
client		server
		HELO
LOGIN
		PLAYER_CODE

Anything else
client		server
		HELO
HOST
		ERROR
		<Close Frame>
This is the only scenario where an error is followed by
an immediate close frame. 

Room join process:

Create new room
client		server
		HOSTJOIN
HOST
		ROOM_CODE

Join an existing room
client		server
		HOSTJOIN
JOIN
		JOIN_OK

Join an expired room
client		server
		HOSTJOIN
JOIN
		BAD_ROOM
At this point the client is responsible for procuring
a new room code