Moved application code to the Application layer

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

ModernKeePass10/Converters/ColorToBrushConverter.cs

@@ -0,0 +1,22 @@
+using System;
+using Windows.UI;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Media;
+
+namespace ModernKeePass.Converters
+{
+    public class ColorToBrushConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, string language)
+        {
+            var color = value is Color color1 ? color1 : default(Color);
+            if (color == default(Color) && parameter is SolidColorBrush) return (SolidColorBrush) parameter;
+            return new SolidColorBrush(color);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, string language)
+        {
+            return (value as SolidColorBrush)?.Color ?? new Color();
+        }
+    }
+}