Add reload menu

Author: matsujirushi

src/AzureSphereExplorer/MainWindow.xaml

@@ -37,6 +37,7 @@
     <DockPanel>
         <Menu DockPanel.Dock="Top">
             <MenuItem Header="View">
+                <MenuItem Header="Reload" Click="menuitemReload_Click"/>
                 <MenuItem Header="Error Reports..." Click="menuitemErrorReports_Click"/>
             </MenuItem>
             <MenuItem Header="Help">

src/AzureSphereExplorer/MainWindow.xaml.cs

@@ -258,6 +258,11 @@ private void menuitemDeviceCopyShowCommand_Click(object sender, RoutedEventArgs
 
         #endregion
 
+        private async void menuitemReload_Click(object sender, RoutedEventArgs e)
+        {
+            await RefreshAllGrids();
+        }
+            
         private async void menuitemErrorReports_Click(object sender, RoutedEventArgs e)
         {
             CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();