[wined3d] D3DCOLOR fixup begin

[Raphael]

Hi,

Changelog:
  - defined D3DCOLOR_B macros to access byte values of D3DCOLOR
  - use D3DCOLOR macros instead of using shift + masks
  - fix a bug where diffuse.lpData checked instead of specular.lpData
  - implement color fixup on ARB VShader compilation code:
     ->  on input parameters using swizzle
     -> add is_color parameter on vshader_program_add_param

Todo:
 -  check shader declaration while compiling VShader to value is_color 
parameter (Oliver have you an idea how to do that ?)
  - implement a fixup code for drawPrimitiveSlow and VBO unlock 

Regards,
Raphael
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