quartz: Add support for the file writer filter

[Maarten Lankhorst]

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This should be in qcap, however it doesn't have the directshow
primitives (wine directshow base classes) that quartz has. If you
reject it for that reason, please let me know..  It is based on the
NullRenderer, but mildly changed with a sed, the change is the
addition of IStream to IPin, and the Sample() code, which is pretty
simple. It works with native avi file writer, which I will work on
implementing next.
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