Fix DrawHLinesExplosions setting invalid map pixels if called at wrap world edge
This caused an errror message after the game when using hammer or pickhammer at wrap world edge.
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.