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gnocl::toolbar menubutton item

Just finished putting the final touches together on implementing this new addition to the toolbar options. The Gtk+ toolbar menu button offers an interesting way of tackling things. As expected it provides the option to select items from a pull-down menu but it also allows a widget to be embedded in the menu item too. The only issue I had was getting the signal handlers working for the icon widget. Somehow I've got separate click signal handlers for both the widget and menu down arrow. Ok, there's a "show-menu" signal for the menu which is what is really called for, but who knows? It might be useful to someone so I'll leave it in.

It's late now (1am) and so I think its best to leave the documentation till the morning.

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