We are removing MSAA for the following reasons:
1. It's broken
2. Fixing it would mean it would perform as well as FSAA, which defeats the purpose of having it
3. It's only supported by DX and Windows
4. Reduction in code complexity
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This pull request is for the pending reorganization of the folder structure on GSdx,
making it better organized and easier to work with.
Also remove unused GSTextureFX.cpp file.