Fix incorrect check for iPhone macro in hwconsts.h
TARGET_OS_IPHONE is always defined when building on Mac OS, so the define was wrong. This macro expands to either 0 or 1, so a simple #if should be enough.
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.