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In looped music, prevent the music channels from drifting out of
sync over time. This was noticeable after a few minutes in the
SCUMM Bar. We do this by extending the last note (which is just
zeroes, so we didn't even use to play it) so that it has the
exact number of samples needed to make all channels the exact
same length. (This is calculated when the music is loaded, so it
does not need any extra data in the save games, thankfully.)
As a result, the getNextNote() is now responsible for converting
the duration to number of samples (out of necessity) and for
converting the note to a pitch modifier (out of symmetry). I made
several false starts before I realized how much easier it would
be this way.
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The Monkey Island and Loom mac music is really quite similar. The
data layout is a bit different, but most of the code was easy to
separate into its own class. The Loom player doesn't do looped music
but I don't remember off-hand if it ever should.
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It turns out that playing the Mac Loom music isn't particularly
different from playing the Monkey Island 1 music, except the data
layout is a bit different and there's no per-note volume.
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