Flying portal balls now spawn a few spark effects
This has been adapted from PortalEffects from HedgeEditor.
HedgeEditor already included such effects for some reason, so they have been removed as redundant.
Directory for automated tests to test the engine.
Run `ctest` in the root directory of this repository to run all tests.
Run `ctest -R <test name>` to run only the test with the given name.
This requires you to have CMake.