Hide creeper from frontend, prevent addition of creeper ammo via ammo scheme
This is a temporary measure because the creeper is still very unfinished.
This can be reverted when the creeper is finished.
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.