direct sound COM fixes and new test

[Robert Reif]

dsound.diff:

Adds class factories for DirectSoundCapture,
DirectSoundFullDuplex and DirectSoundPrivate.
Adds error checking to QueryInterface and
CreateInterface.
Adds some more functionality to property sets.

tests.diff

Adds propset.c which adds some COM and
property set tests.
Adds LIBUUID to makefile.

To Do:

Cleanup property sets to handle both 3d buffers and
DirectSoundPrivate interface properly.
Add tests for 3d buffer property sets.
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