[5/5] WineD3D: Software vertex blending

[Stefan Dösinger]

Patch 6 will add a registry key for advertizing software emulated features

A problem with this is that drawStridedSlow can't operate on data from vbos. I 
don't want to catch this in the state management code because it would add a 
lot of extra checks and dependencies there which aren't necessary for the 
hardware path. Instead drawstridedslow modifies the strided data stored in 
the device. This adds a few exctra constraints on how it can be used(Those 
are documented in the vb code). If there are objections against this we can 
drop the patch.

This patch is based on a hacked vertex blend implementation by Frank Richter.
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