Refactored osgsimpleviewerQT4 to implement a GraphicsWindowQT, and then use multiple inheritance to build the final SimpleViewerQT.
Refactored osgsimpleviewerQT4 to implement a GraphicsWindowQT, and then use
multiple inheritance to build the final SimpleViewerQT.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@5634 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg