besh81 5422c43002 toolbar : added toggle button
Following functions/methods have been add both to toolbar and item_proxy:
bool istoggle() const; ///< Returns true if the tool style is toggle.
				bool toggle() const; ///< Gets the tool toggle state (only if tool style is toggle).
				item_proxy& toggle(bool toggle_state); ///< Sets the tool toggle state (only if tool style is toggle).
				std::string toggle_group() const;	///< Returns the toggle group associated with the tool (only if tool style is toggle).
				item_proxy& toggle_group(const ::std::string& group);	///< Adds the tool to a toggle group (only if tool style is toggle).
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