Native code to go with the ThinkDifferent class that handles macOS-specific API calls.

Currently handles hiding the menu bar, and the basic structure of the native libraries evolved from the jAppleMenuBar project by Hansi Raber and was rewritten for Processing 4 by Ben Fry.

As of 4.2, also includes a method from Python Mode to bring windows to the front.

Helpful reference used for the rewrite:

• JNI Example (Mac OS)
  • https://gist.github.com/DmitrySoshnikov/8b1599a5197b5469c8cc07025f600fdb
• Building a Universal macOS Binary
  • https://developer.apple.com/documentation/apple-silicon/building-a-universal-macos-binary