The `TorchState` enum now provides a new value for unavailable flashlights.
* The `autoStart` attribute has been removed from the `MobileScannerController`. The controller should be manually started on-demand.
* A controller is now required for the `MobileScanner` widget.
* The `onPremissionSet`, `onStart` and `onScannerStarted` methods have been removed from the `MobileScanner` widget. Instead, await `MobileScannerController.start()`.
* The `onPermissionSet`, `onStart` and `onScannerStarted` methods have been removed from the `MobileScanner` widget. Instead, await `MobileScannerController.start()`.
* The `startDelay` has been removed from the `MobileScanner` widget. Instead, use a delay between manual starts of one or more controllers.
* The `onDetect` method has been removed from the `MobileScanner` widget. Instead, listen to `MobileScannerController.barcodes` directly.
* The `overlay` widget of the `MobileScanner` has been replaced by a new property, `overlayBuilder`, which provides the constraints for the overlay.