macOS notarized and self-updating

For those of you using macOS, the game has finally been notarized. This means Apple has verified our software so that you can safely open it without following a 6 step guide on macOS Catalina. This also means that we were finally able to release the self-updater version for macOS users as well. From now on, every time you open the game on macOS, it will check for updates and download and install them if there are any.