Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Calendar/Controls/CalendarItemControl.cs

@@ -0,0 +1,42 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Calendar.Controls
+{
+    public class CalendarItemControl : Control
+    {
+        public ICalendarItem Item
+        {
+            get { return (ICalendarItem)GetValue(ItemProperty); }
+            set { SetValue(ItemProperty, value); }
+        }
+
+        public static readonly DependencyProperty ItemProperty = DependencyProperty.Register(nameof(Item), typeof(ICalendarItem), typeof(CalendarItemControl), new PropertyMetadata(null, new PropertyChangedCallback(OnItemChanged)));
+
+        public CalendarItemControl()
+        {
+            DefaultStyleKey = typeof(CalendarItemControl);
+        }
+
+        private static void OnItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            if (d is CalendarItemControl control)
+            {
+                control.UpdateDateRendering();
+            }
+        }
+
+        private void UpdateDateRendering()
+        {
+            if (Item == null) return;
+
+            UpdateLayout();
+        }
+
+        public override string ToString()
+        {
+            return Item?.Name ?? "NA";
+        }
+    }
+}