GOB: Rewrite the AdLib players

This is a complete rewrite of the AdLib players for ADL and MDY/TBR
files in the Gob engine.

Major changes
1) The AdLib base class is now completely separated from all file
   format code and can theoretically be used by any OPL2-based
   format (within reason)
2) The new code is far better documented and more readable
3) The MDY player now actually works. The MDY/TBR format is
   in reality the MUS/SND format created by AdLib as a simpler
   alternative to the ROL format
4) Since the MAME emulator is quite buggy and leads to noticable
   wrong percussion in the Gobliins 2 title music, the new AdLib
   player will try to create a DOSBox OPL. If it's not compiled in,
   or if the user configured opl_driver to "mame", it will print
   out appropriate warnings.

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