Change SD music for Halloween and Hoggywood themes (old tracks) Rationale: - Halloween: hell music is the logical continuation, default SD music just ruins the atmosphere - Hoggywood: default SD music fits better here; the hell music was historically chosen when there wasn't a generic music yet

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.