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/SettingPath.cs

@@ -0,0 +1,62 @@
+// 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.IO.Abstractions;
+
+namespace Microsoft.PowerToys.Settings.UI.Library
+{
+    public class SettingPath : ISettingsPath
+    {
+        private const string DefaultFileName = "settings.json";
+
+        private readonly IDirectory _directory;
+
+        private readonly IPath _path;
+
+        public SettingPath(IDirectory directory, IPath path)
+        {
+            _directory = directory ?? throw new ArgumentNullException(nameof(directory));
+            _path = path ?? throw new ArgumentNullException(nameof(path));
+        }
+
+        public bool SettingsFolderExists(string powertoy)
+        {
+            return _directory.Exists(System.IO.Path.Combine(LocalApplicationDataFolder(), $"Microsoft\\PowerToys\\{powertoy}"));
+        }
+
+        public void CreateSettingsFolder(string powertoy)
+        {
+            _directory.CreateDirectory(System.IO.Path.Combine(LocalApplicationDataFolder(), $"Microsoft\\PowerToys\\{powertoy}"));
+        }
+
+        public void DeleteSettings(string powertoy = "")
+        {
+            _directory.Delete(System.IO.Path.Combine(LocalApplicationDataFolder(), $"Microsoft\\PowerToys\\{powertoy}"));
+        }
+
+        private static string LocalApplicationDataFolder()
+        {
+            return Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        }
+
+        /// <summary>
+        /// Get path to the json settings file.
+        /// </summary>
+        /// <returns>string path.</returns>
+        public string GetSettingsPath(string powertoy, string fileName = DefaultFileName)
+        {
+            if (string.IsNullOrWhiteSpace(powertoy))
+            {
+                return _path.Combine(
+                    LocalApplicationDataFolder(),
+                    $"Microsoft\\PowerToys\\{fileName}");
+            }
+
+            return _path.Combine(
+                LocalApplicationDataFolder(),
+                $"Microsoft\\PowerToys\\{powertoy}\\{fileName}");
+        }
+    }
+}