Added keyboard mouse binding usage to the osg::ApplicationUsage and

osgGA::GUIEventHandler and its subclasses.

include/osgGA/KeySwitchCameraManipulator

@@ -34,6 +34,8 @@ class OSGGA_EXPORT KeySwitchCameraManipulator : public CameraManipulator
 {
 public:
 
+        virtual const char* className() { return "KeySwitchCamera"; }
+
         /**
         Add a camera manipulator with an associated name, and a key to
         trigger the switch,
@@ -75,6 +77,9 @@ public:
 
         virtual bool handle(const GUIEventAdapter& ea,GUIActionAdapter& us);
 
+        /** Get the keyboard and mouse usage of this manipulator.*/
+        virtual void getUsage(osg::ApplicationUsage& usage) const;
+
 private:
 
         typedef std::pair<std::string, osg::ref_ptr<CameraManipulator> > NamedManipulator;