wined3d: Implented signed texture formats via NV_TEXTURE_SHADER

[Stefan Dösinger]

> It' mostely signedness but also from the specification:
>       OpenGL's pixel map, color table, convolution, color matrix,
>       histogram, and min/max are NOT performed on the HILO components
>       or texture offset group pixel groups.
> (I'm not sure wether these operations are performed when shaders are
> enabled, though.) Also, even GL_HILO8_NV is internally represented by 16
> bits per channel (at least according to the spec).
Wined3d doesn't use them because direct3d does not support them. So no need to 
worry about them :-)

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