Rewrite macOS app

[teusbenschop]

Bibledit now needs ARM64 code too. The current builders do not provide that. At the same time move to Swift too. Create an updated Bibledit app that calls C++ code. The C++ code should be part of the same project, just like in Android Studio. That way Xcode should build the C++ code for two architectures, x86_64 and arm64. This should cater for multiple architectures.

• [x] Create a new macOS app written in Swift.
• [x] Embed a good web view.
• [x] Show embedded content.
• [x] Consider https://stackoverflow.com/questions/32541268/can-i-have-swift-objective-c-c-and-c-files-in-the-same-xcode-project/32546879#32546879
• [x] Add simple C code to the project in Xcode, .h and .c
• [x] Compile the C code.
• [x] Call the C code from Swift.
• [x] Add simple C++ code to the project in Xcode, .h and .cpp
• [x] Compile the C++ code.
• [x] Call the C++ code from Swift.
• [x] Expand the C++ code with multiple dummy calls.
• [x] Let all C++ code work flawlessly.
• [x] Roll the entire Bibledit kernel into the project.
• [x] Port all the Objective-C code to Swift code.
• [x] Test it well.
• [x] Publish it on the App Store.
• [x] Have it reviewed.
• [x] Test on macOS 12.1 - so requires a target of macOS 12.0 instead of 13.0.

[teusbenschop]

The reviewer on the App Store writes:

• your app displayed a white screen at launch and did not proceed.

The app was built on Intel for Apple Silicon and so it should be tested on Apple Silicon too. On an available Mac with M1 processor, it says: You have macOS 12.1. The application requires macOS 13.0 or later.

[teusbenschop]

The app was accepted on the Mac App Store. Closing issue.