* libnautilus-extensions/nautilus-preferences-group.c:
	* libnautilus-extensions/nautilus-preferences-group.h:
	Add support for custom preferences items.

	* libnautilus-extensions/nautilus-preferences-item.h:
	* libnautilus-extensions/nautilus-preferences-item.c:
	Add support for custom preferences items.  For now only the theme
	selector uses this powerful technology.

	Fix bug 8167 - Crash boinking on single-click mode.  It was a dumb
	mistake left over from a previous fix.  Wrong number of arguments
	to a signal.

	Fix bug where strings in enumeration menus would show up
	untranslated in the preferences dialog, even in locales where
	translations exist.

	* libnautilus-extensions/nautilus-theme.h:
	* libnautilus-extensions/nautilus-theme.c: (load_theme_document),
	(nautilus_pixmap_file_may_be_local),
	(nautilus_theme_get_image_path_from_theme),
	(nautilus_theme_make_preview_pixbuf): Rename this function from
	nautilus_theme_make_selector for greater clarity.
	(has_image_file), (theme_get_property), (theme_get_name_property),
	(theme_get_description_property), (theme_list_insert),
	(theme_get_themes_for_location): Replace some cut-n-paste code by
	a shared function.  Add some FIXMEs for the funky handling of the
	"default" theme.
	(theme_get_builtin_themes), (theme_get_user_themes),
	(theme_get_default_themes): Functions for reaping the
	different types of themes available to Nautilus.
	(nautilus_theme_for_each_theme), (theme_list_invoke_callback): New
	function to iterate all the themese available to Nautilus.  Makes
	Nautilus code that needs to operate on themes (like the theme
	selector) easier to write.
	(nautilus_theme_get_user_themes_directory),
	(nautilus_theme_remove_user_theme),
	(nautilus_theme_install_user_theme):  Functions for reaping the
	different types of themes available to Nautilus.

	* src/nautilus-preferences-dialog.c:
	(preferences_dialog_populate_sidebar_tabs_group),
	(theme_changed_callback),
	(update_theme_selector_displayed_value_callback),
	(preferences_dialog_populate_themes_group):
	Add a custom preference item for the theme chooser.

	* src/nautilus-theme-selector.h:
	* src/nautilus-theme-selector.c:
	Use regular Gtk widgets in the list so that all the things that
	are expect to work do indeed work.  This includes Gtk+ theme
	changes and custom tweaks made in the code to satisfy the design.
	Larger and bolder labels for example.

	Simplify this code alot by using iterators for the available
	themes.  Also maintain two lists instead of managing a remove_mode
	boolean.  Makes the code simpler.

	* src/nautilus-window-menus.c:
	(nautilus_window_initialize_menus_part_1):
	Remove the standalone theme selector handling code.

	* src/nautilus-shell-ui.xml:
	Remove the standalone theme selector ui.