some dmusic stuff

[Rok Mandeljc]

This patch adds better debug messages (fixme) to dmusic code (it'll be
useful for further development). It also implements some new but
irrelevant dmusic functions. Dmusic still crashes at some point - I
think it's the problem Raphael reported earlier (when trying to create
dmusic loader object).

MIDI and Performance channels are now faked (apps can set priorities
etc. but at the moment, they're just dummies).

ChangeLog:
  - added debug
  - implemented fake midi & performance channels
  - implemented some IDirectMusic*8* functions where IDirectMusic*
equivalent exists
  - IDirectMusic*8 interfaces can now be obtained from IDirectMusic*
interfaces (QueryInterface...)
  - channel-related performance functions are kinda implemented now
  
-- 
Rok Mandeljc <rok.mandeljc at gimb.org>
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