Removed portal test from demo.cpp
Added new debug draw mode (regions connections).
Tweaked several debug draw modes to be more illustrative.
Added checks in the Detour code to allow to call the API even if the initialization failed.
- added rcFixupAdjacentContours which adjust adjacent contour sets so that that they share all vertices (still buggy!)
- changed the demo stucture to handle tiled navmesh generation process (still ugly)
- the performance results are put into a struct instead of logged immediatelly
- added ChunkyTriMesh class which allows to partiotion a trimesh to smaller pieces using AABB tree
