Update VS project files
-Fix the VS2010 property sheet as the DefDir "macro" needs to be updated as well when the intermediate directories were seperated by project. -Reinstate build/win32/vs10/gtk+.sln with the correct DOS/Windows EOL so that file can be correctly recognized by Windows, without the "Unrecognized Visual Studio Version" problem. -Update solutions and projects where gtk-demo becomes gtk3-demo, to be consistent across the board.
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