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/Interop.cs

@@ -0,0 +1,29 @@
+// 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.Runtime.InteropServices;
+
+namespace Microsoft.PowerToys.Settings.UI
+{
+    internal static class Interop
+    {
+        public static ICoreWindowInterop GetInterop(this Windows.UI.Core.CoreWindow @this)
+        {
+            var unkIntPtr = Marshal.GetIUnknownForObject(@this);
+            try
+            {
+                var interopObj = Marshal.GetTypedObjectForIUnknown(unkIntPtr, typeof(ICoreWindowInterop)) as ICoreWindowInterop;
+                return interopObj;
+            }
+            finally
+            {
+                Marshal.Release(unkIntPtr);
+                unkIntPtr = System.IntPtr.Zero;
+            }
+        }
+
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("StyleCop.CSharp.NamingRules", "SA1310:Field names should not contain underscore", Justification = "Interop naming consistency")]
+        public const int SW_HIDE = 0;
+    }
+}