/tuio2/chg and /tuio2/ocg handling via TuioGeometry

I have implemented the /tuio2/chg and /tuio2/ocg via a new TuioGeometry class, that contains a list of points defining the object geometry. It can be subclassed to support more complex geometry messages, such as /tuio2/ocg for example.
The TuioClient and TuioServer are modified to support the new messages.