create (OptionsMenu)

         # File lib/json/editor.rb, line 682
    682:       def create
    683:         title = MenuItem.new('Options')
    684:         title.submenu = menu
    685:         add_item('Collapsed nodes', nil, CheckMenuItem, &method(:collapsed_nodes))
    686:         @pretty_item = add_item('Pretty saving', nil, CheckMenuItem,
    687:           &method(:pretty_saving))
    688:         @pretty_item.active = true
    689:         window.unchange
    690:         title
    691:       end