Finally got sound system working mostly nice, although more tweaking may
be needed in the future. When sound is turned to 0 sounds don't play
(including music) making it possible to finally shut off the music and
listen to iTunes (if desired)

Still need to skin the slider to look like the Monkey Shines volume
slider and not some out-of-place Java-style slider.
Sound controls appear to finally be skinned properly.

Fixes #3