Fix Lightmappedgeneric and vbsp matrix functions for Parallax Corrected Cubemaps #415
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Shiro assisted in this fix, and now we don't need the custom matrixinvert.h functions anymore, because we use built-in engine functions for inversing Parallax corrected cubemaps. This also fix's the assertion error you'd get when building a map with a debug vbsp. LightmappedGeneric has also been updated so mat_specular 0 doesn't break brushs anymore (parallax didn't check if envmap's existed, thus weird rendering was going on because it was attempting to bind non-existent envmaps to the textures).
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