Implement exit from app

www.eng/js/plugins/VND_CordovaFixes.js

@@ -381,4 +381,16 @@ document.addEventListener("deviceready", () => {
             });
         });
     }
-})
+})
+
+// =============================
+//   Close Android app from JS
+// =============================
+
+SceneManager.terminate = function () {
+    navigator.app.exitApp();
+};
+
+window.close = function() {
+    navigator.app.exitApp();
+}