Adds a functional highscore menu along with a back button
Removes preset highscores and fixes ordering

Anyone who has run an older version will need to uncomment the reset HS
score. Instructions are in that comment, found in Highscore.java.
Adds a highscore reset button to the highscore menu
Highscores are reloaded to HS system after a reset.
Merge pull request #26 from eshsrobotics/highscore-screen

Adds a functional highscore menu along with a back button. Closes #13.