Add auto updater

PamhagenSysCtrl/Windows/PlantSchemeWindow.xaml

@@ -50,6 +50,11 @@
                         <TextBlock FontFamily="Segoe MDL2 Assets" FontSize="16" Text="&#xE946;"/>
                     </MenuItem.Icon>
                 </MenuItem>
+                <MenuItem Header="Nach Updates suchen..." Click="Menu_Help_CheckForUpdates_Click">
+                    <MenuItem.Icon>
+                        <TextBlock FontFamily="Segoe MDL2 Assets" FontSize="16" Text="&#xE895;"/>
+                    </MenuItem.Icon>
+                </MenuItem>
             </MenuItem>
         </Menu>
 

PamhagenSysCtrl/Windows/PlantSchemeWindow.xaml.cs

@@ -75,6 +75,12 @@ namespace PamhagenSysCtrl.Windows {
             } catch { }
         }
 
+        private async void Menu_Help_CheckForUpdates_Click(object sender, RoutedEventArgs evt) {
+            if (Application.Current is App app) {
+                await app.CheckForUpdates(true);
+            }
+        }
+
         private void SchemeCanvas_MouseMove(object sender, MouseEventArgs evt) {
             var p = evt.GetPosition(SchemeCanvas);
             UpdateScheme(evt.GetPosition(SchemeCanvas), evt.LeftButton == MouseButtonState.Pressed);