pygi-convert.sh: Generalize Gtk.Settings migration
pygi-convert.sh: Generalize Gtk.Settings migration

There are other GSettings.get_* functions like get_for_screen().

alexef/pygobject,jdahlin/pygobject,choeger/pygobject-cmake,davidmalcolm/pygobject,pexip/pygobject,Distrotech/pygobject,jdahlin/pygobject,GNOME/pygobject,thiblahute/pygobject,davibe/pygobject,sfeltman/pygobject,Distrotech/pygobject,jdahlin/pygobject,pexip/pygobject,sfeltman/pygobject,pexip/pygobject,sfeltman/pygobject,MathieuDuponchelle/pygobject,davibe/pygobject,nzjrs/pygobject,GNOME/pygobject,MathieuDuponchelle/pygobject,Distrotech/pygobject,davibe/pygobject,davidmalcolm/pygobject,davidmalcolm/pygobject,MathieuDuponchelle/pygobject,alexef/pygobject,nzjrs/pygobject,thiblahute/pygobject,thiblahute/pygobject,Distrotech/pygobject,alexef/pygobject,davibe/pygobject,nzjrs/pygobject,choeger/pygobject-cmake,choeger/pygobject-cmake,GNOME/pygobject