GtkToolItemGroup now has label and label-widget properties.
* demos/gtk-demo/toolpalette.c (load_special_items): Demonstrate gtk_tool_item_group_set_label_widget(). * gtk/gtktoolitemgroup.[h|c]: Rename the "item-group-name" property to "label" because that is what it is. Likewise rename the functions. Add a "label-widget" propert and get/set_label_widget() functions, based on the same code/API in GtkExpander.
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