Bullet: Fix swig with correct Model path
Update swig to version 2.0.10
btHeightfieldTerrainShape, add custom constructors
Add managed const ptr, remove unneeded upcast
Separate bullet and custom code
Fix the bullet tests
Merge branch 'bullet' of https://github.com/xoppa/libgdx into bullet2
Fix bullet build script
Update to 2.81rev2613, remove MiniCL and BulletMultiThreaded
Make btRaycastVehicle nice for SWIG
Split swig interfaces into collision, dynamics and softbody
Swig generated files
Update visual studio project
Fix android and vs build
Merge pull request #468 from xoppa/bullet2

Bullet, update to 2.81