[DMUSIC] Fixes, Segment loading

[Raphael]

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Hi,

 With this patch most of the Dx8SDK DirectMusic samples launchs (and seems to 
work but they don't play anything)

 Changelog:
  - fix DirectSound Creation by dmusic (fix recent Unreal2 regression) using 
Robert Reif patch
  - use of ForegroundWindow if hWnd is NULL (as specified on msdn docs)
  - begin of Performance PMsg implementation (we should use a processing 
thread)
  - better Segment loading
  - some stubs for IsDirty (always FALSE)

Todo:
  - some tracks loading (at least Tempo and SegTrigger)
  - clean dmusic loading codes using new utilities functions 
IDirectMusicImpl_IPersistStream_Parse*Generic and Segment::Load idea

Regards,
Raphael
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