* gladeui/glade-xml-utils.h, gladeui/glade-catalog.[ch], 
	gladeui/glade-widget-adaptor.[ch], gladeui/glade-property-class.[ch],
	gladeui/glade-project.c, glade-palette-item.c: Added "supports" catalog element
	to supply supported formats, added libglade-only and libglade-unsupported properties
	for widget classes and property classes, those metadata will show up in the editor
	like versioning info, in the verify logs as well, and the palette will adjust
	sensitivity according to the new properties.

	* plugins/gtk+/gtk+.xml.in, plugins/gnome/gnome.xml.in: Added supports
	elements and marked widgets/properties as libglade-only/libglade-unsupported in
	the gtk+ catalog.


svn path=/trunk/; revision=1945