dsound error/debug cleanup and bug fixes

[Robert Reif]

This is a rather large patch that does the following:
    makes parameter checking and error notification consistent
    propagates driver and local function errors where needed
    fixes error returns where pointer is given for returned data
    adds 3d listener to primary buffer when needed
    copies 3d part of buffer when duplicated
    fixes bug when primary buffer is reopened with smaller buffer
    loosens requirements on caps data size check
    sets caps for emulated mode based on actual driver caps



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