* Update SDL and SDL_mixer on macOS
* Extend (Intel) Mac compatibility all the way to OS X El Capitan
* Update macOS runner due to GitHub deprecation but still use and Xcode version that supports 10.11
* Add CMake settings to build universal binary and find SDL in app bundle
* Source frameworks from extern folder
* Add build script, info plist and big sur style icon
* Add example build workflow (app won't be signed)
* Use macOS 11 runner for better compatibility
* Use better name for the build script, move metadata to Platform/macOS/ folder
* Improve macOS build instructions
* Fix workflow syntax and use a more specific glob pattern too
* Add libs search paths to CMakeLists.txt instead of find files
* Use same /Libs folder as libs search path
* Make build-mac-app.sh not fail on repeated runs
* Make build-mac-app.sh executable
