Change osgText so that the Text drawable now can have its own StateSet

that users can assign to it without it being overriden.  If none is
assigned externally it now uses a StateSet associated wit the Font assigned
to the Text.

include/osgText/Font

@@ -88,6 +88,11 @@ public:
 
     virtual std::string getFileName() const;
 
+
+    void setStateSet(osg::StateSet* stateset) { _stateset = stateset; }
+    osg::StateSet* getStateSet() { return _stateset.get(); }
+    const osg::StateSet* getStateSet() const { return _stateset.get(); }
+
     /** Set the pixel width and height hint.*/
     virtual void setFontResolution(unsigned int width, unsigned int height);
     
@@ -152,6 +157,8 @@ protected:
     typedef std::pair< unsigned int, unsigned int >         SizePair;
     typedef std::map< SizePair, GlyphMap >                  SizeGlyphMap;
     
+
+    osg::ref_ptr<osg::StateSet>     _stateset;
     SizeGlyphMap                    _sizeGlyphMap;
     GlyphTextureList                _glyphTextureList;
     StateSetList                    _stateSetList;