constants (the Mesa bug) and VRally use the 0..95 indexes so fix it
- fix normalize for some HW VertexShader inputs
- trying to fix the combination of NV_texture_combine_4 with
texture_combine_EXT (impl of D3DTOP_DISABLE, D3DTOP_MODULATE for
NV_texture_combine_4)
- if shaders disabled declare to support 0 for MaxVertexShaderConst.