qedit: Implement partially the Sample Grabber filter

[Paul Chitescu]

Changelog:
	qedit: Implement partially the Sample Grabber filter

The IMediaPosition, IMediaSeeking and IQualityControl interfaces are currently 
not implemented at all. No programs I've tested tried to query them though.

Buffering of samples is also not implemented yet, applications usually install 
an ISampleGrabberCB callback.

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