Objective-C FFI with starting wrapper for the Cocoa, AppKit and Foundation kits/frameworks

Notes:
* Tweaks to `tests.sh` enables testing some programs on OS X only.
* This is the foundation for more PRs.
* Most cocoa tests are UNDEFINED because they use log. I'll add more tests with simple strings in the future.
* More tests for the FFI are needed.

Yep, en bonus tu as des paramètres nommés sur tes méthodes!