- Many cost functions now use PhantomAgent::GetDistanceSquared() instead of re-computing it. This saves a lot of time overall!
- WorldBase/Infinite/Toric: Faster construction of neighbor lists.

- Policy now stores cost functions as CostFunction* instead of shared_ptr<CostFunction>, which could cause unexpeced bottlenecks when running on multiple threads.
- CostFunction registration now uses modern C++ templates and lambda expressions, instead of C-style macros.
- Removed costFunctionRegistration.h/.cpp.

- Changed the OneWayFlow200 scenario to use a toric world.

GoalReachingForces and RandomFunction now have a default range of 0, because they do not consider any neighboring objects.

- Changed PhantomAgent so that it only stores an offset, and not an actual translated position. This allows the simulation to re-use a PhantomAgent over multiple frames, so we can now decide to do neighbor queries less often.
- Changed other classes accordingly.

Merge of the GUI branch

See merge request !102

- Added more documentation to HelperFunctions, Polygon2D, and Color.

- Now ignoring the output and screenshots folders.

- Updated README.md to mention the GUI, Qt, and ORCA.

- Now drawing the bounding-box of a toric world.
- ZoomToFit() uses this bounding box as well.

- HelperFunctions: Added functions for checking/creating directories, taken from CSVWriter.
- Cleaned up CSVWriter accordingly.
- OpenGLWidget: Screenshots and CSVs are now added to a folder that is automatically created.

- Fixed the behavior of several GUI elements.
- Bugfix in CrowdSimulator::StopCSVOutput().
- CSVWriter: Added the "flushImmediately" variable, which is required for the GUI application.
- Screenshots are now written to a different folder.

- CMakeLists: Fixed reference to the Qt resources folder.

- Total simulation time is now stored as a double.

- Changed CMakeLists accordingly.

- Added a project with the necessary files.
- Updated CMake settings.
- Added 3rd-party code for polygon triangulation.
- Added tools/Color and tools/HelperFunctions.
- Vector2D: Added code for disk approximation.
- Renamed WorldBase::Type values, due to naming conflicts with Qt.
- Moved some code to Library and ConsoleApplication subfolders.

Performance improvements

See merge request !101