opcodes

send opcodes (server -> client)

leading byte	semantics
`0x00`	This is a list of active games/servers.
`0x01`	New game or join game request accepted/denied.
`0x02`	Here's the state of the game.
`0x03`	Here's a chat message that someone sent.

leading byte	semantics
`0x00`	Send me a list of active games/servers.
`0x01`	Request a new game.
`0x02`	Here is info about my game.
`0x03`	Here are my inputs.
`0x04`	I'm leaving my game.
`0x05`	I'd like to join this game.
`0x06`	Here's a chat message I'm sending.