-Update the project files to simplify them a bit after the seperation of
 GDK-Pixbuf (move GDK-Pixbuf includes into the property sheet, move the
 linking of Cairo/Pango/PangoCairo into the property sheet)--this is for
 all DLL/EXE Projects (GDK/GTK/gtk-demo)

-Update the GDK-Win32 project as the source files have changed
 significantly (especially as GDK3 was not compilable on Windows for a
 while--thanks to Hans Breuer for the help in the process-Bug 639127)

-Made up for missed headers in the "install" stage and removed the removed
 headers in the property sheet

-Updated GTK+ .def file generation as an extra macro is needed for that

-Updated gdk/Makefile.am for the generation of gdk.vcproj from gdk.vcprojin