Optimization

Some optimizations are in progress

- Labyrinth field array renamed form labyrinth to fields and is now a array of type short.
- WayPoit is no longer a Point, most of the point Funktionality was not needed. The WayPoint coordinates variable are now of short type, too.
- A second optimized Labyrinth is in progress. At this time it is called LabyrinthO. In a later release it will replace the old labyrinth.