Scenario saving supports waypoints. Scenario4 now has only one object

- Changed scenario4 to have only one object
- Added objects with waypoints to the scenario saving code
- Fixed bug with saving scenarios where heading and viewing angle were
being converted incorrectly
- Fixed saving scenarios to conform to new load-by-class-name mechanism
for AI nodes (from one of my earlier commits)
- Removed CameraController.update_confidence_original(). It was
identical to update_confidence save for a line or two
- Formatting here and there