This migrates Flutter to use the `@main` attribute introduced in Swift 5.3. The `@UIApplicationMain` attribute is deprecated and will be removed in Swift 6. See: https://github.com/apple/swift-evolution/blob/main/proposals/0383-deprecate-uiapplicationmain-and-nsapplicationmain.md This change is split into two commits: 1. ad18797428 - This updates the iOS app template and adds a migration to replace `@UIApplicationMain` uses with `@main`. 2. 8ecbb2f29f - I ran `flutter run` on each Flutter iOS app in this repository to verify the app migrates and launches successfully. Part of https://github.com/flutter/flutter/issues/143044
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This extracts the sample code out from the API doc comments, and places them in separate files on disk, allowing running of the examples locally, testing them, and building of slightly larger examples.