No longer jiggle sticky mines if using portable portal device
This fixes the sticky mine sound playing when using portal gun while any sticky mine is placed on ground.
We decided that placed sticky mines can't be teleported.
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.