DebugTools: doc++
Shapes: Collision object, providing more detailed collision information.
Shapes: (detailed) collision of sphere vs. point.
Shapes: (detailed) collision of two spheres.
Shapes: minor cleanup.
Shapes: added InvertedSphere shape.
Shapes: collision of InvertedSphere and Point.
Shapes: collision of InvertedSphere and Sphere.
Shapes: mention inverted shapes in the introductory docs.
DebugTools: support for InvertedSphere in ShapeRenderer.

Currently drawn in the same way as Sphere.
Shapes: documented detailed collisions.