enable URDF loading throught the 'File/Open' menu

set a default camera targets for each demo. note that it is only reset when switching to a different demo, so you can restart at your chosen location.
no OpenCL pairbench drawing in OpenGL2 (there is no VBO available etc)

examples/RenderingExamples/RaytracerSetup.cpp

@@ -378,7 +378,7 @@ void RaytracerPhysicsSetup::syncPhysicsToGraphics(GraphicsPhysicsBridge& gfxBrid
 {
 }
 
- CommonExampleInterface*    RayTracerCreateFunc(struct PhysicsInterface* pint, struct GUIHelperInterface* helper, int option)
+ CommonExampleInterface*    RayTracerCreateFunc(struct CommonExampleOptions& options)
  {
-	 return new RaytracerPhysicsSetup(helper->getAppInterface());
+	 return new RaytracerPhysicsSetup(options.m_guiHelper->getAppInterface());
  }