[QuickAccent]Theming support (#22446)

* Adding theme awereness

* Adding theming colors

* High contrast

* Downgrade ModernWPF package

* Adding ModernWPF and PowerToys.Common.UI to installer

* Removing unused file and MahApps

* Removed MahApps from installer string

* fix projects and setup

* removed PowerAccent

* addressed PR feedback

Co-authored-by: Davide <25966642+davidegiacometti@users.noreply.github.com>

src/modules/poweraccent/PowerAccent.UI/Program.cs

@@ -0,0 +1,90 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Diagnostics;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows;
+using interop;
+using ManagedCommon;
+using PowerAccent.Core.Tools;
+
+namespace PowerAccent.UI;
+
+internal static class Program
+{
+    private static readonly CancellationTokenSource _tokenSource = new CancellationTokenSource();
+    private static App _application;
+    private static int _powerToysRunnerPid;
+
+    [STAThread]
+    public static void Main(string[] args)
+    {
+        if (PowerToys.GPOWrapper.GPOWrapper.GetConfiguredQuickAccentEnabledValue() == PowerToys.GPOWrapper.GpoRuleConfigured.Disabled)
+        {
+            Logger.LogWarning("Tried to start with a GPO policy setting the utility to always be disabled. Please contact your systems administrator.");
+            return;
+        }
+
+        Arguments(args);
+
+        InitEvents();
+
+        _application = new App();
+        _application.InitializeComponent();
+        _application.Run();
+    }
+
+    private static void InitEvents()
+    {
+        Task.Run(
+            () =>
+            {
+                EventWaitHandle eventHandle = new EventWaitHandle(false, EventResetMode.AutoReset, Constants.PowerAccentExitEvent());
+                if (eventHandle.WaitOne())
+                {
+                    Terminate();
+                }
+            }, _tokenSource.Token);
+    }
+
+    private static void Arguments(string[] args)
+    {
+        if (args?.Length > 0)
+        {
+            try
+            {
+                if (int.TryParse(args[0], out _powerToysRunnerPid))
+                {
+                    Logger.LogInfo($"QuickAccent started from the PowerToys Runner. Runner pid={_powerToysRunnerPid}");
+
+                    RunnerHelper.WaitForPowerToysRunner(_powerToysRunnerPid, () =>
+                    {
+                        Logger.LogInfo("PowerToys Runner exited. Exiting QuickAccent");
+                        Terminate();
+                    });
+                }
+            }
+            catch (Exception ex)
+            {
+                Debug.WriteLine(ex.Message);
+            }
+        }
+        else
+        {
+            Logger.LogInfo($"QuickAccent started detached from PowerToys Runner.");
+            _powerToysRunnerPid = -1;
+        }
+    }
+
+    private static void Terminate()
+    {
+        Application.Current.Dispatcher.BeginInvoke(() =>
+        {
+            _tokenSource.Cancel();
+            Application.Current.Shutdown();
+        });
+    }
+}