First pass at navigation with MasterDetail

Aurora/Frontend/Components/ContentPresenter.cs

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+using System;
+using Xamarin.Forms;
+
+namespace Aurora.Frontend.Components
+{
+    public class ContentPresenter : ContentView
+    {
+        public static readonly BindableProperty ItemTemplateProperty = BindableProperty.Create("ItemTemplate", typeof(DataTemplate), typeof(ContentPresenter), null, propertyChanged: OnItemTemplateChanged);
+
+        private static void OnItemTemplateChanged(BindableObject bindable, object oldvalue, object newvalue)
+        {
+            var cp = (ContentPresenter)bindable;
+
+            var template = cp.ItemTemplate;
+            if (template != null)
+            {
+                var content = (View)template.CreateContent();
+                cp.Content = content;
+            }
+            else
+            {
+                cp.Content = null;
+            }
+        }
+
+        public DataTemplate ItemTemplate
+        {
+            get
+            {
+                return (DataTemplate)GetValue(ItemTemplateProperty);
+            }
+            set
+            {
+                SetValue(ItemTemplateProperty, value);
+            }
+        }
+    }
+}