Resolve promise when startTabBasedApp and startSingleScreenApp complete.

Fix props loading from PropsRegistry in custom buttons

This reverts commit e69f3801b9.

This fix allows to pass unserializable props to custom buttons, such as navigator or functions.

* Make Navigator Public

* Make Screen.js export both Screen and Navigator

* Update Navigation.js to import Screen correctly

* Make Navigator public for Android too

* Forgot to export after importing

* ESLint fix

* ESLint fix

* ESLint Fix

* ESLint Fix

returns true if NavigationActivity is resumed (startApp was called)

* added method for getting the currently visible screen ID. Can be useful to decide if logic should be applied according to screen visibility, for example: set buttons/title dynamically, or even determine that you don’t need to show the same screen again if it’s the current one that’s showing

* Implement getCurrentlyVisibleScreenId on Android

Can be used statically:
Navigation.getCurrentlyVisibleScreenId() - returns the unique screen
instance id

With a navigator instance:
await this.props.navigator.screenIsCurrentlyVisible() - resolves a
promise that checks if the current screen is visible

Currently startApp is called from global context which results in the
app being launched when headlessJs tasks run in the background.
In order to support this use case, while not breaking existing users,
this commit adds two mechanisms which should help users detrmine if
the native Activity is running and startApp can be called safely.

1. RNN.appLaunched event is emitted is SplashActivity starts and react
   context has already been created. This is the use case of openeing
   the app while headless js task was started or has just finished and
   react context is in a "pasued" state.

2. Navigation.isAppLaunched() convenience method has been added.
   It returns a promise which when resolved, indicates if the app
   is launched and we should show the ui or not.

Usage

import {Navigation, NativeEventsReceiver} from 'react-native-navigation';

Promise.resolve(Navigation.isAppLaunched())
  .then(appLaunched => {
    if (appLaunched) {
      startApp();
    } else {
      new NativeEventsReceiver().appLaunched(startApp);
    }
  });

function startApp() {
  Navigation.startTabBasedApp({ ... });
}

Add payload param to handleDeepLink

When snackbar cta is clicked - event is dispatched with the specified eventId

* Support for ApolloStack

* Pass options to redux Provider

This reverts commit c2ef2608c1.

* Added default testId to registered components

* Added default testID to registered components

* Corrected screenId to screenID

* Added default testId to registered components

* Added default testID to registered components

This class handles all Android specific logic. Currently only startTabBasedApp is implemented,
but in the future all interactions with the UI will go here.