Moved ThemeManager in common project (#8835)

* moved theme manager in common project

* added analyzers

* renamed CommonUI project

src/common/Microsoft.PowerToys.Common.UI/CustomLibraryThemeProvider.cs

@@ -0,0 +1,24 @@
+// 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.Collections.Generic;
+using ControlzEx.Theming;
+
+namespace Microsoft.PowerToys.Common.UI
+{
+    public class CustomLibraryThemeProvider : LibraryThemeProvider
+    {
+        public static readonly CustomLibraryThemeProvider DefaultInstance = new CustomLibraryThemeProvider();
+
+        public CustomLibraryThemeProvider()
+            : base(true)
+        {
+        }
+
+        /// <inheritdoc />
+        public override void FillColorSchemeValues(Dictionary<string, string> values, RuntimeThemeColorValues colorValues)
+        {
+        }
+    }
+}