[WINED3D] Improve pshader code structure

[Ivan Gyurdiev]

The point of this patch is to pull out things like modifier processing 
(write masks, saturate, swizzle) from different case statements, and put 
them in a more common path, which simplifies code, and makes sure we 
don't miss cases. Also, reorder things as appropriate to get rid of the 
crazy continue/switch flow control that's confusing me. Dead code paths 
were also if0'ed.

Patch introduces undesired effect that now input and output modifiers 
are allowed on all instructions, which is definitely not valid according 
to MSDN. However, I don't think we should care at this point, since 
processing of valid shaders, and simplifying the code path should take 
precedence. We can add validation later in a more appropriate place [ 
the current "validation" is to completely disable or enable modifiers on 
certain instructions, which is not correct either - and it should fail, 
not just print a fixme on error ].

Patch will enable processing _bx2 modifier on certain texture 
instructions, which is valid in shaders 1.2/1.3. Also, is negation and 
swizzling valid on texture instructions in 3.0? If it is, this will 
process it. Also will enable write mask processing in some texture 
instructions where it previously wasn't, generating more correct shader.

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