MSVC Builds: Apply Visual Style for Win32 Print Dialog

MSVC Builds: Apply Visual Style for Win32 Print Dialog

Define ISOLATION_AWARE_ENABLED for the build of the GTK DLL so that visual
style can be applied to the Windows print dialog for all applications using
gtkprintoperation.

Update the script for the generation of gtk-win32.rc for MSVC to not try to
embed the manifest from it (but embed libgtk3.manifest by including it in
the project files, as we are now doing), and embedding the manifest file is
really not supported in MSVC 2010 and later.

Also fix up formatting in the GTK DLL projects.

https://bugzilla.gnome.org/show_bug.cgi?id=733773