Remove UserDialogs plugin and dependencies for extension. Use custom/native dialogs for extension. Added modern http client to resolve TLS issues in extension. Dismiss and reload table for add site in extension.

src/iOS.Core/Utilities/Dialogs.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Drawing;
+using CoreGraphics;
+using UIKit;
+
+namespace Bit.iOS.Core.Utilities
+{
+    public static class Dialogs
+    {
+        public static UIAlertController CreateLoadingAlert(string message)
+        {
+            var loadingIndicator = new UIActivityIndicatorView(new CGRect(10, 5, 50, 50));
+            loadingIndicator.HidesWhenStopped = true;
+            loadingIndicator.ActivityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray;
+            loadingIndicator.StartAnimating();
+
+            var alert = UIAlertController.Create(null, message, UIAlertControllerStyle.Alert);
+            alert.View.TintColor = UIColor.Black;
+            alert.View.Add(loadingIndicator);
+            return alert;
+        }
+
+        public static UIAlertController CreateAlert(string title, string message, string accept)
+        {
+            var alert = UIAlertController.Create(title, message, UIAlertControllerStyle.Alert);
+            var oldFrame = alert.View.Frame;
+            alert.View.Frame = new RectangleF((float)oldFrame.X, (float)oldFrame.Y, (float)oldFrame.Width, (float)oldFrame.Height - 20);
+            alert.AddAction(UIAlertAction.Create(accept, UIAlertActionStyle.Default, null));
+            return alert;
+        }
+    }
+}