* gtk/gtksettings.c: (settings_install_property_parser): Handle enums too.
* gtk/gtktoolbar.c (gtk_toolbar_class_init): Move the gtk-toolbar-style and
gtk-toolbar-icon-size settings into GtkSettings because we now use it in
GtkToolPalette too.
* gtk/gtktoolpalette.[h|c]: Add gtk_tool_palette_unset_style() and
gtk_tool_palette_unset_icon_size(), and use the toolbar-style and
icon-size from GtkSettings if these are not set via the set functions.
* demos/gtk-demo/toolpalette.c (on_combo_style_changed),
(do_toolpalette): Add and handle a -1 value to mean the desktop "Default"
toolbar style.
* 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.
