[D3DXOF] Use Interlocked* functions in AddRef and Release

[Paul Vriens]

Hi,

we are slowly getting there. 

A next janitorial task could be to get TRACE's everywhere where we have
AddRef's and Releases and have them more consistent in there output?

Not inlined because of size.

Changelog:
- use Interlocked* functions in AddRef and Release.
- store the result of the Interlocked functions and use only this.
- Add TRACEs to display the ref count.

Cheers,

Paul Vriens
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