Remove react-native; rewrite main screen in (native) swift

ios/Application/AppDelegate.swift

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import UIKit
+
+@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate {
+
+    var window: UIWindow?
+    var backend = Backend(databaseOpener: IosDatabaseOpener(withLog: StandardLog()),
+                          fileOpener: IosFileOpener(),
+                          log: StandardLog())
+    
+    func application(_ application: UIApplication,
+                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        
+        window = UIWindow(frame: UIScreen.main.bounds)
+        if let window = window {
+            let nav = UINavigationController()
+            nav.viewControllers = [ListHabitsController(withBackend: backend)]
+            window.backgroundColor = UIColor.white
+            window.rootViewController = nav
+            window.makeKeyAndVisible()
+        }
+        return true
+    }
+}