Pass deep link to NavigationActivity

This commit introduces a simple mechanism to pass deep link data from
MainActivity/SplashActivity to NavigationActivity. Note that this will
not work if the application is already running.

android/app/src/main/java/com/reactnativenavigation/controllers/Linking.java

+package com.reactnativenavigation.controllers;
+
+import android.content.Intent;
+import android.net.Uri;
+
+import static android.content.Intent.ACTION_VIEW;
+
+public class Linking {
+    private static Uri initialUri;
+
+    static void saveInitialUri(Uri initialUri) {
+        Linking.initialUri = initialUri;
+    }
+
+    static void setInitialUri(Intent intent) {
+        if (initialUri != null) {
+            intent.setData(initialUri);
+            intent.setAction(ACTION_VIEW);
+            clear();
+        }
+    }
+
+    private static void clear() {
+        initialUri = null;
+    }
+}

android/app/src/main/java/com/reactnativenavigation/controllers/NavigationCommandsHandler.java

         } else {
             intent = new Intent(NavigationApplication.instance, NavigationActivity.class);
         }
+        Linking.setInitialUri(intent);
         intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
         intent.putExtra(ACTIVITY_PARAMS_BUNDLE, params);
         NavigationApplication.instance.startActivity(intent);

android/app/src/main/java/com/reactnativenavigation/controllers/SplashActivity.java

     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setSplashLayout();
+        Linking.saveInitialUri(getIntent().getData());
     }
 
     @Override