Visual Studio builds: Improve Introspection build process
Adapt the Visual Studio project files to output the introspection files in the same directories where the built binaries are located from the previous patch. Also, make the gtk3-introspect project dependent on the gdk-3 and gtk-3 projects only, so that we can build the introspection files without needing to finish the whole build process. In order to "install" the built introspection files, the gtk3-install project is now where this is being done. Note that the introspection builds is still not built by default at this point.
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