included pacman's lives in GameplayState; set to 3.
when the user loses the third time, a notification will appear;
after closing it, the game is still going - need a fix!
eating a ghost in powerUp-mode gives now increasing points.
if the highscore is in the TOP 10, the user can enter a name which
will be stored in the highscore.
if the user wins a level, the next level in the levelList will be
initialized; actual last level, which will be repeated, is "Extended 3".