Bugfix update and minor changes:
- Fixed crash that happened when duplicating empty rails
- Fixed issue with rail duplication where duplicated rails would have shared connections on their points. You can now edit the connections on one rail without it affecting the other rail, including connecting points as a loop.
- Default values for a new inserted rail point are now -1 instead of 0.
- Renamed the arguments of a rail point from Pitch/Yaw/Roll/Speed to Value 1-4. This is because Pitch/Yaw/Roll/Speed is only correct for rotating objects and misleading for other types of objects that have different arguments.