common: refactor common library pt2 (#8588)

- remove common lib
- split settings, remove common-md
- move ipc interop/kb_layout to interop
- rename core -> settings, settings -> old_settings
- os-detect header-only; interop -> PowerToysInterop
- split notifications, move single-use headers where they're used
- winstore lib
- rename com utils
- rename Updating and Telemetry projects
- rename core -> settings-ui and remove examples folder
- rename settings-ui folder + consisent common/version include

src/settings-ui/Microsoft.PowerToys.Settings.UI.Library/StringProperty.cs

@@ -0,0 +1,33 @@
+// 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.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.PowerToys.Settings.UI.Library
+{
+    // Represents the configuration property of the settings that store string type.
+    public class StringProperty
+    {
+        public StringProperty()
+        {
+            Value = string.Empty;
+        }
+
+        public StringProperty(string value)
+        {
+            Value = value;
+        }
+
+        // Gets or sets the integer value of the settings configuration.
+        [JsonPropertyName("value")]
+        public string Value { get; set; }
+
+        // Returns a JSON version of the class settings configuration class.
+        public override string ToString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+}