Added osg::BufferObject and a made a number associated to accomodate this

new class. osg::BufferObject wraps up OpenGL pixel and array buffer objects.
Currently implementation is work in progress.

include/osgText/Text

@@ -230,10 +230,10 @@ public:
     virtual void accept(osg::Drawable::ConstAttributeFunctor& af) const;
 
     /** return true, osgText::Text does support accept(PrimitiveFunctor&) .*/
-    virtual bool supports(osg::Drawable::PrimitiveFunctor&) const { return true; }
+    virtual bool supports(osg::PrimitiveFunctor&) const { return true; }
 
     /** accept a PrimtiveFunctor and call its methods to tell it about the interal primtives that this Drawable has.*/
-    virtual void accept(osg::Drawable::PrimitiveFunctor& pf) const;
+    virtual void accept(osg::PrimitiveFunctor& pf) const;
 
 
     // make Font a friend to allow it set the _font to 0 if the font is