Updated UWP app to work with local in-app calendars

GUT.Schedule/GUTSchedule.UWP/ClearCalendarControl.xaml

@@ -0,0 +1,26 @@
+<ContentDialog
+    x:Class="GUTSchedule.UWP.ClearCalendarControl"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	xmlns:appointments="using:Windows.ApplicationModel.Appointments"
+	mc:Ignorable="d"
+	x:Uid="clearScheduleTitle"
+	Loaded="ContentDialog_Loaded"
+	Title="Clear schedule calendar"
+	
+	SecondaryButtonText="Cancel"
+	PrimaryButtonText="Clear">
+
+	<StackPanel>
+		<ListView SelectionMode="Multiple" x:Name="targetsList">
+			<ListView.ItemTemplate>
+				<DataTemplate x:DataType="appointments:AppointmentCalendar">
+					<TextBlock Text="{Binding DisplayName}"/>
+				</DataTemplate>
+			</ListView.ItemTemplate>
+		</ListView>
+		<CheckBox x:Uid="clearUpcoming" Content="Remove only upcoming events" x:Name="clearUpcoming"/>
+	</StackPanel>
+</ContentDialog>