Gib mi MIDI

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This release introduces MIDI auto-configuration for selected titles:

• STAR WARS™ - Dark Forces
• X-COM: UFO Defense
• X-COM: Terror From the Deep
• Jagged Alliance Gold
• Jagged Alliance Deadly Games

Just click "Play" and enjoy glorious MIDI music, there's no need to hunt those pesky SETSOUND.EXE programs.

If you don't like MIDI music, then turn it off with midi.enable = false or SDOS_NO_MIDI and these games will be reconfigured back to use emulated Sound Blaster for music.

Other changes:

• dosbox.bin configuration option renamed to dosbox.cmd and now accepts full commands and not only paths.
• fix last-chance fallback for midi soundfont to default.sf2