Blender Git Loki

BGE: merge Recast & Detour branch (sock-2010-nicks).

Add navigation mesh capability to the BGE, both by logic bricks and python.
Add tools to creation navigation mesh in the creator:
- manualy
- automatically from existing mesh with "object.create_navmesh" operator
- automatically from existing mesh with "Navigation mesh" modifier
Editing navigation mesh is possible via special modifier edit mode.
Creation and modification of Navigation mesh is also possible at runtime in the BGE.

Documentation at http://wiki.blender.org/index.php/User:Nicks/Gsoc2010/Docs

Warning: No upgrade is provided for blend files created under the branch.
If you load a blend with navigation data created with a branch
build, it will likely crash blender or behave incorrectly.