move btTriangleInfoMap.h into its own header, into the BulletCollision/CollisionShapes folder
add btTriangleInfoMap pointer to btBvhTriangleMeshShape, so we don't need to use the 'userpointer' anymore
preparation for serialization of btTriangleInfoMap.
See also http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=4603&start=30
See also http://code.google.com/p/bullet/issues/detail?id=27 for issue description and an example how to use this (a modified version of Bullet/Demos/ConcaveDemo)
This demo will be committed to Bullet/Demos/ConcaveDemo later.