text: /**
   * @imports all from GameState, setPlayerPosition
   * @param datagram
   *      - parse datagram.data
   *      - based on type, call:
   *          move-player   -> setPlayerPosition with id and coordinates
   *          enter-player  -> ??
   *          player-left   -> GameState.removePlayer with id
   *          new-player    -> GameState.addPlayer with player
   *          welcome       -> GameState.setPlayer with id
   *                           GameState.addPlayers with players
   *                           GameState.setArenaSize with arenaSize
   *          update-score  -> GameState.updateScores with players
   *          revive-player -> GameState.revivePlayer with id
   *          resize-player -> GameState.resizePlayer with id and radius
   *                           setPlayerPosition with id and coordinates
   *          update-name   -> GameState.setPlayerName with id and name
   * 
   *      - for an other type, print "Unknown message type."
   * @exports processDatagram
   */
  