remove the old web plugin

-import 'dart:async';
-import 'dart:html' as html;
-import 'dart:ui_web' as ui;
-
-import 'package:flutter/services.dart';
-import 'package:flutter_web_plugins/flutter_web_plugins.dart';
-import 'package:mobile_scanner/mobile_scanner_web.dart';
-import 'package:mobile_scanner/src/enums/barcode_format.dart';
-import 'package:mobile_scanner/src/enums/camera_facing.dart';
-
-/// This plugin is the web implementation of mobile_scanner.
-/// It only supports QR codes.
-class MobileScannerWebPlugin {
-  static void registerWith(Registrar registrar) {
-    final PluginEventChannel event = PluginEventChannel(
-      'dev.steenbakker.mobile_scanner/scanner/event',
-      const StandardMethodCodec(),
-      registrar,
-    );
-    final MethodChannel channel = MethodChannel(
-      'dev.steenbakker.mobile_scanner/scanner/method',
-      const StandardMethodCodec(),
-      registrar,
-    );
-    final MobileScannerWebPlugin instance = MobileScannerWebPlugin();
-
-    channel.setMethodCallHandler(instance.handleMethodCall);
-    event.setController(instance.controller);
-  }
-
-  // Controller to send events back to the framework
-  StreamController controller = StreamController.broadcast();
-
-  // ID of the video feed
-  String viewID = 'WebScanner-${DateTime.now().millisecondsSinceEpoch}';
-
-  static final html.DivElement vidDiv = html.DivElement();
-
-  /// Represents barcode reader library.
-  /// Change this property if you want to use a custom implementation.
-  ///
-  /// Example of using the jsQR library:
-  /// void main() {
-  ///   if (kIsWeb) {
-  ///     MobileScannerWebPlugin.barCodeReader =
-  ///         JsQrCodeReader(videoContainer: MobileScannerWebPlugin.vidDiv);
-  ///   }
-  ///   runApp(const MaterialApp(home: MyHome()));
-  /// }
-  static WebBarcodeReaderBase barCodeReader =
-      ZXingBarcodeReader(videoContainer: vidDiv);
-  StreamSubscription? _barCodeStreamSubscription;
-
-  /// Handle incomming messages
-  Future<dynamic> handleMethodCall(MethodCall call) async {
-    switch (call.method) {
-      case 'start':
-        return _start(call.arguments as Map);
-      case 'torch':
-        return _torch(call.arguments);
-      case 'stop':
-        return cancel();
-      case 'updateScanWindow':
-        return Future<void>.value();
-      default:
-        throw PlatformException(
-          code: 'Unimplemented',
-          details: "The mobile_scanner plugin for web doesn't implement "
-              "the method '${call.method}'",
-        );
-    }
-  }
-
-  /// Can enable or disable the flash if available
-  Future<void> _torch(arguments) async {
-    barCodeReader.toggleTorch(enabled: arguments == 1);
-  }
-
-  /// Starts the video stream and the scanner
-  Future<Map> _start(Map arguments) async {
-    var cameraFacing = CameraFacing.front;
-    if (arguments.containsKey('facing')) {
-      cameraFacing = CameraFacing.values[arguments['facing'] as int];
-    }
-
-    ui.platformViewRegistry.registerViewFactory(
-      viewID,
-      (int id) {
-        return vidDiv
-          ..style.width = '100%'
-          ..style.height = '100%';
-      },
-    );
-
-    // Check if stream is running
-    if (barCodeReader.isStarted) {
-      final hasTorch = await barCodeReader.hasTorch();
-      return {
-        'ViewID': viewID,
-        'videoWidth': barCodeReader.videoWidth,
-        'videoHeight': barCodeReader.videoHeight,
-        'torchable': hasTorch,
-      };
-    }
-    try {
-      List<BarcodeFormat>? formats;
-      if (arguments.containsKey('formats')) {
-        formats = (arguments['formats'] as List)
-            .cast<int>()
-            .map(BarcodeFormat.fromRawValue)
-            .toList();
-      }
-
-      final Duration? detectionTimeout;
-      if (arguments.containsKey('timeout')) {
-        detectionTimeout = Duration(milliseconds: arguments['timeout'] as int);
-      } else {
-        detectionTimeout = null;
-      }
-
-      await barCodeReader.start(
-        cameraFacing: cameraFacing,
-        formats: formats,
-        detectionTimeout: detectionTimeout,
-      );
-
-      _barCodeStreamSubscription =
-          barCodeReader.detectBarcodeContinuously().listen((code) {
-        if (code != null) {
-          controller.add({
-            'name': 'barcodeWeb',
-            'data': {
-              'rawValue': code.rawValue,
-              'rawBytes': code.rawBytes,
-              'format': code.format.rawValue,
-              'displayValue': code.displayValue,
-              'type': code.type.rawValue,
-              if (code.corners.isNotEmpty)
-                'corners': code.corners
-                    .map(
-                      (Offset c) => <Object?, Object?>{'x': c.dx, 'y': c.dy},
-                    )
-                    .toList(),
-            },
-          });
-        }
-      });
-
-      final hasTorch = await barCodeReader.hasTorch();
-      final bool? enableTorch = arguments['torch'] as bool?;
-
-      if (hasTorch && enableTorch != null) {
-        await barCodeReader.toggleTorch(enabled: enableTorch);
-      }
-
-      return {
-        'ViewID': viewID,
-        'videoWidth': barCodeReader.videoWidth,
-        'videoHeight': barCodeReader.videoHeight,
-        'torchable': hasTorch,
-      };
-    } catch (e, stackTrace) {
-      throw PlatformException(
-        code: 'MobileScannerWeb',
-        message: '$e',
-        details: stackTrace.toString(),
-      );
-    }
-  }
-
-  /// Check if any camera's are available
-  static Future<bool> cameraAvailable() async {
-    final sources =
-        await html.window.navigator.mediaDevices!.enumerateDevices();
-    for (final e in sources) {
-      // TODO:
-      // ignore: avoid_dynamic_calls
-      if (e.kind == 'videoinput') {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  /// Stops the video feed and analyzer
-  Future<void> cancel() async {
-    await barCodeReader.stop();
-    await barCodeReader.stopDetectBarcodeContinuously();
-    await _barCodeStreamSubscription?.cancel();
-    _barCodeStreamSubscription = null;
-  }
-}