Code Migration and Improvement

[ndonkoHenri]

• Ads
• AlertDialog
• AnimatedSwitcher
• AppBar
• Audio
• AudioRecorder
• AutoComplete
• AutoFillGroup
• Banner
• BannerAd
• BarChart
• BottomAppBar
• BottomSheet
• Buttons
• Canvas
• Card
• CheckBox
• Chip
• CircleAvatar
• Column
• Container
• CupertinoActionSheet
• CupertinoActionSheetAction
• CupertinoActivityIndicator
• CupertinoAlertDialog
• CupertinoAppBar
• CupertinoBottomSheet
• CupertinoButton
• CupertinoCheckBox
• CupertinoContextMenu
• CupertinoContextMenuAction
• CupertinoDatePicker
• CupertinoDialogAction
• CupertinoFilledButton
• CupertinoListTile
• CupertinoNavigationBar
• CupertinoPicker
• CupertinoRadio
• CupertinoSegmentedButton
• CupertinoSlider
• CupertinoSlidingSegmentedButton
• CupertinoSwitch
• CupertinoTextField
• CupertinoTimerPicker
• DataTable
• DatePicker
• Dismissible
• Divider
• Draggable
• DragTarget
• Dropdown
• ElevatedButton
• ExpansionPanel
• ExpansionTile
• FilePicker
• FilledButton
• FilledTonalButton
• Flashlight
• FletApp
• FloatingActionButton
• GeoLocator
• GestureDetector
• GridView
• HapticFeedback
• Icon
• IconButton
• Image
• InteractiveViewer
• InterstitialAd
• LineChart
• ListTile
• ListView
• Lottie
• Map
• MapCircleLayer
• MapMarkerLayer
• MapPolygonLayer
• MapPolylineLayer
• MapRichAttribution
• MapSimpleAttribution
• MapTextSourceAttribution
• MapTileLayer
• Markdown
• MatplotlibChart
• MenuBar
• MenuItemButton
• MergeSemantics
• NavigationBar
• NavigationDrawer
• NavigationRail
• OutlinedButton
• Page
• Pagelet
• PermissionHandler
• PieChart
• Placeholder
• PlotlyChart
• PopupMenuButton
• ProgressBar
• ProgressRing
• Radio
• RangeSlider
• ResponsiveRow
• Rive
• Row
• SafeArea
• SearchBar
• SegmentedButton
• SelectionArea
• Semantics
• SemanticsService
• ShaderMask
• ShakeDetector
• Slider
• SnackBar
• Stack
• SubmenuButton
• Switch
• Tabs
• Text
• TextButton
• TextField
• TimePicker
• TransparentPointer
• VerticalDivider
• Video
• View
• WebView
• WindowDragArea