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.Extension/SiteListViewController.cs

@@ -74,10 +74,17 @@ namespace Bit.iOS.Extension
                 if(addSiteController != null)
                 {
                     addSiteController.Context = Context;
+                    addSiteController.Parent = this;
                 }
             }
         }
 
+        public void DismissModal()
+        {
+            DismissModalViewController(true);
+            TableView.ReloadData();
+        }
+
         public class TableSource : UITableViewSource
         {
             private const string CellIdentifier = "TableCell";