HLSL compiler

[Fabian Maurer]

I'd like to take a try at Directx10 support, firstmost hacking the HLSL 
compiler (namely implementing "fx_4_0"). No guarantee I'll succeed though.

First, is there already someone working on this? Don't wanna duplicate the 
effort again.

Second, since there already is an existing parser: Did you plan to simply 
extend it and make one parser for all HLSL versions, or to duplicate the code 
and have it separate for each version like the official compiler did it? I think 
I'd just add it to d3dcompiler_43.