libgimpwidgets: deprecate GimpUnitMenu and gimp_prop_unit_menu_new()
Add gimp_prop_unit_combo_box_new() and adapt all places using the prop_unit_menu. Some things are broken now, like there are no pixel digits set, resolution unit menus show "pixels" and warn badly when pixels is selected, and file-pdf-load is not built right now. More fixes to come...
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