fixed buffer:ReadLongLong() returning long
bytes can now be added inbetween structs
added utilities.StringToLongLong(str)
added steam.IsSteamClientAvailible()
added key steam.GetAuthTokenFromServer(server_id, ip, port, secure)
added steam.SteamIDToCommunityID(id)
added steam.CommunityIDToSteamID(id)
added join_server test (wip!)