Visual Studio builds: Generate .pc files
Generate .pc files for the package, so that it would be easier for building introspection for packages that depend on GTK+. Also split PythonPath into PythonPath and PythonPathX64 to facilitate the build of introspection files, which need to have Python that is built with the same ac=rchitecture where GTK+ is built. Clean up the formatting and spacing a bit.
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