Implement first draft of pybullet.createVisualShape and add createVisualShape.py example

add normals to duck.obj for nicer appearance
fix plane100.urdf (so collision shape matches visual shape size)

examples/SharedMemory/SharedMemoryPublic.h

@@ -624,6 +624,13 @@ enum eUrdfCollisionFlags
 	GEOM_FORCE_CONCAVE_TRIMESH=1,
 };
 
+enum eUrdfVisualFlags
+{
+	GEOM_VISUAL_HAS_RGBA_COLOR=1,
+	GEOM_VISUAL_HAS_SPECULAR_COLOR=2,
+};
+
+
 enum eStateLoggingFlags
 {
 	STATE_LOG_JOINT_MOTOR_TORQUES=1,