qedit.dll: Add minimal stubs for NullRenderer and SampleGrabber

[Paul Chitescu]

Changelog:
	qedit.dll: Add minimal stubs for NullRenderer and SampleGrabber.

It doesn't make much sense to break this patch in two since most applications 
connect a SampleGrabber to a NullRenderer to capture frames.

CLSID_SampleGrabber was missing from uuids.h

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