quartz: Make wave parser and mpeg splitter zero copy

[Maarten Lankhorst]

The mpeg splitter and wave parser would just copy source data over to
a new sample, This is suboptimal. The new code will just hand out the
source samples directly by getting rid of the separate memory
allocator. My goal is to get rid of the PullPin_Standard_Request,
since the 3 pullpin implementations that use it all have their own
idea how to implement it. Avi splitter might be broken because of it,
but I'm trying to fix it. It's more complicated though.
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