xfce_icon_theme -> gtk_icon_theme?

[Jasper Huijsmans]

Hey Brian,

I was wondering if we should try and port all xfce modules to use 
GtkIconTheme and/or turn XfceIconTheme into a small wrapper.

The only thing I see that gtk icon theme does not support is the use of 
icon lists. Maybe we should just give up on that and use 'xfce-' 
namespaced icons instead or possibly icons named according to the 
proposed icon naming spec on freedesktop.org.

What do you think? It would save quite some duplicated effort, isn't it?

	Jasper