quartz: Improve seeking on the mpeg splitter

[Maarten Lankhorst]

By removing the lock that's held in the thread most of the time and
making the filter hold on to the sample (when hr == S_FALSE) until it
is succesfully parsed Start/Stop/Pause etc now work a whole lot
better. Thanks to the previous patch the lock does not need to be held
any more. The OutputPin does the locking where needed. Cleaning up is
done by the clean function passed to PullPin_Construct.
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