Option to toggle the system tray icon (#23220)

* Added option to toggle the system tray icon

At the moment, this hides the icon making the settings window inaccessible without first modifying the general `settings.json` file.

* Use IPC messages to manage the tray icon settings

* Fix launching second window binds to active settings process

* Added context menu option to hide tray icon

* Added Exit PT button to settings ui NavigationView.PaneFooter

* Moved DllImports to NativeMethods.cs

* Sentence case titles

* Fix whitespace

* Re-add exit icon to NavView

* Re-added toggle switch to new UI

* Fix build

* Fix build after merge main

* Fix the string to display

* add shut down buttons

* finish polish

* fix string

* Styling tweaks to titlebar and settingscards

* fix comment

* fix unit test

* fix ut

---------

Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>
Co-authored-by: vanzue <vanzue@outlook.com>
Co-authored-by: Kayla Cinnamon <cinnamon@microsoft.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>

src/settings-ui/Settings.UI/SettingsXAML/Flyout/LaunchPage.xaml.cs

@@ -176,7 +176,7 @@ namespace Microsoft.PowerToys.Settings.UI.Flyout
             });
         }
 
-        private void ReportBugBtn_Click(object sender, RoutedEventArgs e)
+        internal void ReportBugBtn_Click(object sender, RoutedEventArgs e)
         {
             ViewModel.StartBugReport();