Added a viewer.sync to the end of all the demos.

Removed the Win32 remapping of keycodes from the osgProducer::EventAdapter.

examples/osgprerender/osgprerender.cpp

@@ -439,6 +439,9 @@ int main( int argc, char **argv )
         viewer.frame();
         
     }
+    
+    // wait for all cull and draw threads to complete before exit.
+    viewer.sync();
 
     return 0;
 }