[change] Organize unimplemented modules in directories

Creates a {path}/index.js for each module that has no web
implementation. This enables the babel preset to rewrite all paths and
prevent apps from bundling unused modules.

Fix #1281
Close #1282

packages/babel-plugin-react-native-web/src/moduleMap.js

@@ -1,55 +1,82 @@
 // THIS FILE IS AUTOMATICALLY GENERATED. DO NOT EDIT.
 module.exports = {
   AccessibilityInfo: true,
+  ActionSheetIOS: true,
   ActivityIndicator: true,
   Alert: true,
+  AlertIOS: true,
   Animated: true,
   AppRegistry: true,
   AppState: true,
   AsyncStorage: true,
   BackHandler: true,
   Button: true,
+  CameraRoll: true,
   CheckBox: true,
   Clipboard: true,
   ColorPropType: true,
+  DatePickerAndroid: true,
+  DatePickerIOS: true,
   DeviceInfo: true,
   Dimensions: true,
+  DrawerLayoutAndroid: true,
   Easing: true,
   EdgeInsetsPropType: true,
   FlatList: true,
   I18nManager: true,
   Image: true,
   ImageBackground: true,
+  ImageEditor: true,
+  ImagePickerIOS: true,
+  ImageStore: true,
+  InputAccessoryView: true,
   InteractionManager: true,
   Keyboard: true,
   KeyboardAvoidingView: true,
   LayoutAnimation: true,
   Linking: true,
   ListView: true,
+  MaskedViewIOS: true,
   Modal: true,
   NativeEventEmitter: true,
   NativeModules: true,
+  NavigatorIOS: true,
   NetInfo: true,
   PanResponder: true,
+  PermissionsAndroid: true,
   Picker: true,
+  PickerIOS: true,
   PixelRatio: true,
   Platform: true,
   PointPropType: true,
   ProgressBar: true,
+  ProgressBarAndroid: true,
+  ProgressViewIOS: true,
+  PushNotificationIOS: true,
   RefreshControl: true,
   SafeAreaView: true,
   ScrollView: true,
   SectionList: true,
+  SegmentedControlIOS: true,
+  Settings: true,
   Share: true,
   Slider: true,
+  SnapshotViewIOS: true,
   StatusBar: true,
+  StatusBarIOS: true,
   StyleSheet: true,
   SwipeableFlatList: true,
   SwipeableListView: true,
   Switch: true,
+  Systrace: true,
+  TVEventHandler: true,
+  TabBarIOS: true,
   Text: true,
   TextInput: true,
   TextPropTypes: true,
+  TimePickerAndroid: true,
+  ToastAndroid: true,
+  ToolbarAndroid: true,
   Touchable: true,
   TouchableHighlight: true,
   TouchableNativeFeedback: true,
@@ -57,9 +84,12 @@ module.exports = {
   TouchableWithoutFeedback: true,
   UIManager: true,
   Vibration: true,
+  VibrationIOS: true,
   View: true,
+  ViewPagerAndroid: true,
   ViewPropTypes: true,
   VirtualizedList: true,
+  WebView: true,
   YellowBox: true,
   createElement: true,
   findNodeHandle: true,