Tools/MeshExtractor: Adjusted some parameters.
Tools/MeshExtractor: Corrected some generation code.
Tools/MeshExtractor: Some more changes.

Load the neighbor tiles when loading an ADT for building.
Tools/MeshExtractor: Define the DT_POLYREF64 macro for RecastNavigation and fixed a possible crash.
Tools/MeshExtractor: Changed the naming of the output debug files.