New color to brush converter

New boolean to visibility converter
Base class to handle property changes notifications for all View Models
Template selector to handle a different first item in listviews or gridviews

ModernKeePass/Converters/ColorToBrushConverter.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Drawing;
+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 ? (Color?) value : Color.Empty;
+            if (color == Color.Empty && parameter is SolidColorBrush) return (SolidColorBrush) parameter;
+            return new SolidColorBrush(Windows.UI.Color.FromArgb(
+                color.Value.A,
+                color.Value.R,
+                color.Value.G,
+                color.Value.B));
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, string language)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}