Moved application code to the Application layer

Imported Win10 project
Code cleanup
WIP - Use common UWP services for Win8.1 and Win10

ModernKeePass/Common/NavigationHelper.cs

@@ -1,9 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows.Input;
 using Windows.System;
 using Windows.UI.Core;
 using Windows.UI.Xaml;

ModernKeePass/Common/NotifyPropertyChangedBase.cs

@@ -1,28 +0,0 @@
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Runtime.CompilerServices;
-
-namespace ModernKeePass.Common
-{
-    public class NotifyPropertyChangedBase : INotifyPropertyChanged
-    {
-        public event PropertyChangedEventHandler PropertyChanged;
-
-        protected void OnPropertyChanged(string propertyName = "")
-        {
-            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-        }
-
-        protected bool SetProperty<T>(ref T property, T value, [CallerMemberName] string propertyName = "")
-        {
-            if (EqualityComparer<T>.Default.Equals(property, value))
-            {
-                return false;
-            }
-
-            property = value;
-            OnPropertyChanged(propertyName);
-            return true;
-        }
-    }
-}

ModernKeePass/Common/ResourceHelper.cs

@@ -0,0 +1,16 @@
+using Windows.ApplicationModel.Resources;
+
+namespace ModernKeePass.Common
+{
+    public class ResourceHelper
+    {
+        private const string ResourceFileName = "CodeBehind";
+        private readonly ResourceLoader _resourceLoader = ResourceLoader.GetForCurrentView();
+
+        public string GetResourceValue(string key)
+        {
+            var resource = _resourceLoader.GetString($"/{ResourceFileName}/{key}");
+            return resource;
+        }
+    }
+}

ModernKeePass/Common/ToastNotificationHelper.cs

@@ -3,7 +3,6 @@ using Windows.Data.Json;
 using Windows.Data.Xml.Dom;
 using Windows.UI.Notifications;
 using ModernKeePass.Interfaces;
-using ModernKeePass.ViewModels;
 
 namespace ModernKeePass.Common
 {