Got a high score working. It's all in the PlayMenu with two methods at
the bottom, and I wrote a JLabel for it but its not really completely
visible because the grid layout cuts it off.

Basically it loads the HS, if there is none, it sets it at 99999 (ill
rewrite it so that it displays something else), and once you win the
game it sets your current time as the HS if its lower than the previous
HS.