Version 20

V0.20 (05/24)

• Fixed issue #8 - add hi-score to show on menu screen: this was fairly easy, but i did ended up duplicating code from the gameover screen, not ideal, but not a big deal.
• Fixed github issue #9 - hanging sound on endscreen: i had forgot to set PSGStop(), fixed.
• Fixed issue #10 - white border appearing on the text only screens:  set the correct pallete, column seems to be using sprite pallete color 0, since there are no sprites on screen, easy fix on this particular case. 

Still need to record a new voice sample and... i think that is it?