[WINED3D] Improve pshader code structure (Try 2: move src handling)

[Ivan Gyurdiev]

Patch moves source modifiers and swizzle handling to a more common path, 
stops manipulating pToken other than at the beginning when 
destination/source are parsed. Also fixes a bug from a previous patch 
where a continue was removed with no following break.

While it may allow some invalid shaders to proceed further, I think it 
makes the code cleaner.
It also allows handling of swizzle on 1.4 texld, which I believe is valid.
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