Remove black pixels at corners of DrawRoundRect rectangles
Fixes regression introduced in 8935dcc0e1307f3963d2d21e4f7ce1cca8407579.
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.