* Cleanup
* CMake cleanups
* Update current year
* Update copyright header
* Use script to return list of all modules
* Update credits, license and ghoul
* Implement new RenderableTrails as abstract base class
- Implement RenderableTrailsOrbit and RenderableTrailsTrajectory as concrete instances
Remove old RenderableTrails and RenderableTrailsNew classes
Adapt mod files to the new structure
* Addressed Pull Request comments