Pacman working and 0.68

So Pacman is working ; though I think I've set the default speed a bit slow. This isn't because it can't go faster, it's just an arbitrary choice.

Definitely will fix that because I've just realised I forgot to decrement the life counter when you lose a life. Which makes it a bit easy.

I'll fix that for the next upload though.

This is version 0.68. One bug fix ; there was a gap between sounds in the queue which threw timing and the sound effects out. I've also add min() max() and quiet() to the keywords.