* plugins/gtk+/gtk+.xml.in: Marked some properties to be "themed-icon"

	* gladeui/glade-xml-utils.h, gladeui/glade-property-class.[ch], 
	gladeui/glade-editor-property.c: Added a tag to mark string properties
	that are "themed-icon", use the themed icon chooser for those properties.

	* gladeui/glade-name-icon-chooser.[ch], gladeui/icon-naming-spec.c: Added
	  themed icon chooser (bug 359640).


svn path=/trunk/; revision=1552