[WINED3D] Addline cleanup

[Ivan Gyurdiev]

This patch:
- unifies pixel shader addline() with vertexshader PSTRNCAT(), and puts 
the result into baseshader.c to be shared
- merges its 3 arguments into a structure called SHADER_BUFFER
- the varargs were based on Vitaliy Margolen's idea/patch, but I might 
have a diff. implementation

Dependencies:
Hopefully none, but the patch was written with the following applied:
- Roderick's get_register_type() for vertexshader.c
- My patch for QueryInterface corrections
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