Immersive dark mode + Theme Listener (#18315)

* C++ impl of immersive dark mode

* Stop using the hardcoded value.

* Conjured up theme listener based on registry.

* Update MainWindow.xaml.cpp

* Update expect.txt

* Moved themehelpers to the common themes lib.

* Ported theme helpers back to .NET

* Update expect.txt

* Updated C# Theme Listening logic to mimic the one from Windows Community Toolkit.

* Replaced unmanaged code for RegisterForImmersiveDarkMode with unmanaged ThemeListener class.

* Fix upstream changes

* Update ThemeListener.h

* Update ThemeListener.h

* Proper formatting

* Added handler to Keyboard Manager.

* Update EditKeyboardWindow.cpp

* Added dwmapi.lib to runner, removed condition from additional dependencies.

* Update PowerRenameUI.vcxproj

* Added new deps for ManagedCommon to Product.wxs

* Crude attempts and understanding installer

* Removed Microsoft.Win32.Registry.dll from product.wxs.

* Updated dictionary

* Renamed ThemeListener class file for consistency, removed unused CheckImmersiveDarkMode in theme_helpers.

* Update Themes.vcxproj

* Update theme_listener.cpp

* Removed SupportsImmersiveDarkMode version check

* Removed SupportsImmersiveDarkMode version check

* Whoops

* Update expect.txt

src/common/Themes/theme_helpers.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <windows.h>
+
+enum class AppTheme
+{
+    Dark = 0,
+    Light = 1
+};
+
+struct ThemeHelpers
+{
+    static AppTheme GetAppTheme();
+    static void ThemeHelpers::SetImmersiveDarkMode(HWND window, bool enabled);
+};