Added new buttons to allow user to select audio/visual mode.  Original
play button now randomly selects between the two.  I made several
changes to the way the script is sent from MainMenue to GameView and
GameModel.  Originally, the scan object in MainMenue was static, and set
whenever a file was downloaded.  GameModel would then access this static
variable to retrieve the file handle of the script.  Now that we have
multiple possible scripts, this model doesn't make sense.  Instead, a
file handle for the script is passed from MainMenue to GameView, which
then passes it to GameModel.