Changed build OSG_USE_REF_PTR_IMPLICIT_OUTPUT_CONVERSION to ON and then fixed all the resulting build errors.

src/osgAnimation/Action.cpp

@@ -26,7 +26,7 @@ osgAnimation::Action::Callback* osgAnimation::Action::getFrameCallback(unsigned
 {
     if (_framesCallback.find(frame) != _framesCallback.end())
     {
-        return _framesCallback[frame];
+        return _framesCallback[frame].get();
     }
     return 0;
 }