Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core.UWP/Controls/WinoFontIconSource.cs

@@ -0,0 +1,35 @@
+using Windows.UI.Xaml;
+using Wino.Core.UWP.Controls;
+
+namespace Wino.Controls
+{
+    public class WinoFontIconSource : Microsoft.UI.Xaml.Controls.FontIconSource
+    {
+        public WinoIconGlyph Icon
+        {
+            get { return (WinoIconGlyph)GetValue(IconProperty); }
+            set { SetValue(IconProperty, value); }
+        }
+
+        public static readonly DependencyProperty IconProperty = DependencyProperty.Register(nameof(Icon), typeof(WinoIconGlyph), typeof(WinoFontIconSource), new PropertyMetadata(WinoIconGlyph.Flag, OnIconChanged));
+
+        public WinoFontIconSource()
+        {
+            FontFamily = new Windows.UI.Xaml.Media.FontFamily("ms-appx:///Assets/WinoIcons.ttf#WinoIcons");
+            FontSize = 32;
+        }
+
+        private static void OnIconChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
+        {
+            if (obj is WinoFontIconSource fontIcon)
+            {
+                fontIcon.UpdateGlyph();
+            }
+        }
+
+        private void UpdateGlyph()
+        {
+            Glyph = ControlConstants.WinoIconFontDictionary[Icon];
+        }
+    }
+}