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

ios/Application/Platform/IosExtensions.swift

@@ -0,0 +1,33 @@
+/*
+ * 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
+
+extension Color {
+    var uicolor: UIColor {
+      return UIColor(red: CGFloat(self.red),
+                     green: CGFloat(self.green),
+                     blue: CGFloat(self.blue),
+                     alpha: 1.0)
+    }
+    
+    var cgcolor : CGColor {
+        return uicolor.cgColor
+    }
+}