SCUMM: Added support for Macintosh music in Monkey Island 1

This is based on the old Mac0-to-General MIDI conversion that we used
to do (and which this patch removes), as well as the code for playing
the Monkey Island 2 and Fate of Atlantis Macintosh music. I'm not sure
how accurate it is, particularly in tempo and volume, but at this
point it seems to work pretty well. Looping music is perhaps a bit
off, but it was before as well.

There is an annoying drawn out note in the music when you're following
the shopkeeper, but that appears to have been there in the original as
well.

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