[TODO] Before stable-release

[skim0119]

• Remove InteractionPlane: replaced with RodPlaneContact and RodPlaneContactWithAnisotropicFriction. ([Bug] Fix sphere-rod contact #513)
• Remove PovRAY and ffmpeg examples ([Examples] Clean up for V1 release #502)
• Callback close() method is not called #498
• Remove integrate from examples and documentation ([Examples] Clean up for V1 release #502)
• Fix sphere contact model _find_min_dist add collision volume for rod sphere contact #510