MADE: Split up the music player class to support other platforms

[ccawley2011]

Macintosh music hasn't been implemented yet, but it should be relatively simple to reuse the Halestorm driver from the Kyra engine.

[bluegr]

Is the Mac version music format supported by the Halestorm driver? I was under the impression that all versions use the same music format

[ccawley2011]

There's some discussion on the subject on Discord: https://discord.com/channels/581224060529148060/711242520415174666/1379133782518665279

[bluegr]

The Mac version doesn't even start at the moment. It seems to have either endianess issues, or differences in opcodes.

This is a step towards the right direction, so once we manage to get the Mac version working, we can check for the music format and music playing.

Thanks! Merging