Cold startup js refactor (#1598)

* Switch to SingleDex and remove all locales

* WIP Mattermost Start Component for lazy loading modules

* Add files changed for native modules

* Add Entry component and app global object

* dispatch setStatusBarHeight for iOS

* Update screen imports

* Include Entry screen

* Refactor app to mattermost.android.js

* Override unnecessary java files

* Fix minor issues in changes

* Display empty state based on user credentials

Also, add proper background theme for empty loading screen

* Add native module constant cache support

* Fix startup theme regression

* Add Keychain support for credentials

* Fix Orientation regression

*  Fix SharedExtension regression

* Emit NATIVE_APP_LAUNCHED across bridge only once during cold start

* Add iOS Support

* Revert to previous implementation of i18n

* Fix styling issues

* Include listener for SERVER_VERSION_CHANGED

* Add SafeAreaView in Entry screen

* Register deviceToken early, in order to get iOS PN Support

* Include StartTimeModule

* Add ReplyFromPush support and remove NATIVE_APP_LAUNCHED listener

* Package native constants in StartTimeModule and avoid bridge calls

* Fix check-style errors

* Code cleanup

* Rename StartTimeModule to InitializationModule

* Remove NavigationApplication

* Documentation and minor changes

* Account for app opening after SharedExtension

* Refactor getIntl to getTranslations

* Move native module constants into it's own forked repos

* Include FetchBlob and DeviceInfo forked repos

android/app/src/main/java/com/mattermost/rnbeta/NotificationReplyService.java

@@ -32,6 +32,8 @@ public class NotificationReplyService extends HeadlessJsTaskService {
             int notificationId = intent.getIntExtra(CustomPushNotification.NOTIFICATION_ID, -1);
             CustomPushNotification.clearNotification(mContext, notificationId, channelId);
 
+            MainApplication app = (MainApplication) this.getApplication();
+            app.replyFromPushNotification = true;
             Log.i("ReactNative", "Replying service");
             return new HeadlessJsTaskConfig(
                     "notificationReplied",