New toast action to show toast messages from XAML

Code cleanup for Sonar
Tests corrections

ModernKeePass/Actions/ToastAction.cs

@@ -0,0 +1,33 @@
+using Windows.UI.Xaml;
+using Microsoft.Xaml.Interactivity;
+using ModernKeePass.Common;
+
+namespace ModernKeePass.Actions
+{
+    public class ToastAction : DependencyObject, IAction
+    {
+        public string Title
+        {
+            get { return (string)GetValue(TitleProperty); }
+            set { SetValue(TitleProperty, value); }
+        }
+
+        public static readonly DependencyProperty TitleProperty =
+            DependencyProperty.Register("Title", typeof(string), typeof(ToastAction), new PropertyMetadata(string.Empty));
+
+        public string Message
+        {
+            get { return (string)GetValue(MessageProperty); }
+            set { SetValue(MessageProperty, value); }
+        }
+
+        public static readonly DependencyProperty MessageProperty =
+            DependencyProperty.Register("Message", typeof(string), typeof(ToastAction), new PropertyMetadata(string.Empty));
+
+        public object Execute(object sender, object parameter)
+        {
+            ToastNotificationHelper.ShowGenericToast(Title, Message);
+            return null;
+        }
+    }
+}