sound3d stub implementations, part I

[Rok Mandeljc]

I've managed to run ultima ix with openglide, but sound doesn't really work (3D sound is silent). So I've decided to try to implement stubs in sound3d.c in dsound. This is first part of it. It's my first real work, so someone please check it if it's ok (it seems logical to me, but it could be wrong).

Changelog:
    - implemented IDirectSound3DBufferImpl_Get*() functions
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