Coding style

In certain scenarios we do need to import files instead of features but
even then it is our coding style to not write the file extension.

modules/API/external/external_api.js

 import EventEmitter from 'events';
 
-import { urlObjectToString } from '../../../react/features/base/util/uri.js';
+import { urlObjectToString } from '../../../react/features/base/util/uri';
 import {
     PostMessageTransportBackend,
     Transport

react/features/base/connection/actions.web.js

     connectionEstablished,
     connectionFailed,
     setLocationURL
-} from './actions.native.js';
+} from './actions.native';
 
 /**
  * Opens new connection.

react/features/mobile/image-cache/react-native-img-cache.android.js

-export * from './react-native-img-cache.yes.js';
+export * from './react-native-img-cache.yes';

react/features/mobile/image-cache/react-native-img-cache.ios.js

-export * from './react-native-img-cache.yes.js';
+export * from './react-native-img-cache.yes';