[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/Themes/HighContrast2.xaml

@@ -0,0 +1,26 @@
+<ResourceDictionary
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:system="clr-namespace:System;assembly=System.Runtime">
+
+    <!--  Metadata  -->
+    <system:String x:Key="Theme.Name">HighContrast.Accent3</system:String>
+    <system:String x:Key="Theme.Origin">PowerToysRun</system:String>
+    <system:String x:Key="Theme.DisplayName">Accent3 (HighContrast)</system:String>
+    <system:String x:Key="Theme.BaseColorScheme">HighContrast</system:String>
+    <system:String x:Key="Theme.ColorScheme">Accent3</system:String>
+    <Color x:Key="Theme.PrimaryAccentColor">White</Color>
+
+    <SolidColorBrush x:Key="SecondaryBackgroundBrush" Color="#FF1c1c1c" />
+    <SolidColorBrush
+        x:Key="PrimaryBackgroundBrush"
+        Opacity="0.3"
+        Color="#FF3A3A3A" />
+    <SolidColorBrush x:Key="WindowBorderBrush" Color="#FF00ff00" />
+    <SolidColorBrush
+        x:Key="DividerBorderBrush"
+        Opacity="0.0837"
+        Color="#FFFFFFFF" />
+    <SolidColorBrush x:Key="PrimaryForegroundBrush" Color="#FF00ff00" />
+    <SolidColorBrush x:Key="SecondaryForegroundBrush" Color="#FFc0c0c0" />
+</ResourceDictionary>