Update Endgame Mechanics/added score

@ Ball.java
- x/xa/y/ya variables changed to public static for access
- pointscounter renamed to hitsCounter
- new static acces to the xy/xa/ya coordinates of the ball
-implemented scoreing methods instad of gameOver method
-difficulty counter reduced to 7 and 14

@ Game.java
- Game method accessed as public static
- gameOver method Removed and replaced with 2 scoring method.
- New method playGame houses the while loop that tuns the game, this
makes is accessible
-EPIC SCOREING AND GAME ENDING MEHANICS!!!!!!!!!