register bodies added to a boxworld
add collision detection and notification
- added a new body generator for a ground object
add flatworld object deletion support
identify registered bodies with an is() method
add flatspace warphole bodies
notify application module when a warphole state changes
set flatspace warphole states to realspace warphole state.
notify application module when a ball transits an open flatspace warphole
add ball to realspace when notified of transit