Rename the [Ee]xts dir to ext (#38852)

**WARNING:** This PR will probably blow up all in-flight PRs

at some point in the early days of CmdPal, two of us created seperate
`Exts` and `exts` dirs. Depending on what the casing was on the branch
that you checked one of those out from, it'd get stuck like that on your
PC forever.

Windows didn't care, so we never noticed.

But GitHub does care, and now browsing the source on GitHub is basically
impossible.

Closes #38081

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WindowWalker/Commands/KillProcessCommand.cs

@@ -0,0 +1,80 @@
+// 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.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.CmdPal.Ext.WindowWalker.Components;
+using Microsoft.CmdPal.Ext.WindowWalker.Helpers;
+using Microsoft.CmdPal.Ext.WindowWalker.Properties;
+using Microsoft.CommandPalette.Extensions;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+
+namespace Microsoft.CmdPal.Ext.WindowWalker.Commands;
+
+internal sealed partial class KillProcessCommand : InvokableCommand
+{
+    private readonly Window _window;
+
+    public KillProcessCommand(Window window)
+    {
+        Icon = new IconInfo("\xE74D"); // Delete symbol
+        Name = $"{Resources.windowwalker_Kill}";
+        _window = window;
+    }
+
+    /// <summary>
+    /// Method to initiate killing the process of a window
+    /// </summary>
+    /// <param name="window">Window data</param>
+    /// <returns>True if the PT Run window should close, otherwise false.</returns>
+    private static bool KillProcess(Window window)
+    {
+        // Validate process
+        if (!window.IsWindow || !window.Process.DoesExist || string.IsNullOrEmpty(window.Process.Name) || !window.Process.Name.Equals(WindowProcess.GetProcessNameFromProcessID(window.Process.ProcessID), StringComparison.Ordinal))
+        {
+            ExtensionHost.LogMessage(new LogMessage() { Message = $"Cannot kill process '{window.Process.Name}' ({window.Process.ProcessID}) of the window '{window.Title}' ({window.Hwnd}), because it doesn't exist." });
+
+            // TODO GH #86 -- need to figure out how to show status message once implemented on host
+            return false;
+        }
+
+        // Request user confirmation
+        if (SettingsManager.Instance.ConfirmKillProcess)
+        {
+            // TODO GH #138, #153 -- need to figure out how to confirm kill process? should this just be the same status thing... maybe not? Need message box? Could be nested context menu.
+            /*
+            string messageBody = $"{Resources.wox_plugin_windowwalker_KillMessage}\n"
+                + $"{window.Process.Name} ({window.Process.ProcessID})\n\n"
+                + $"{(window.Process.IsUwpApp ? Resources.wox_plugin_windowwalker_KillMessageUwp : Resources.wox_plugin_windowwalker_KillMessageQuestion)}";
+            MessageBoxResult messageBoxResult = MessageBox.Show(
+                messageBody,
+                Resources.wox_plugin_windowwalker_plugin_name + " - " + Resources.wox_plugin_windowwalker_KillMessageTitle,
+                MessageBoxButton.YesNo,
+                MessageBoxImage.Warning);
+
+            if (messageBoxResult == MessageBoxResult.No)
+            {
+                return false;
+            }
+            */
+        }
+
+        // Kill process
+        window.Process.KillThisProcess(SettingsManager.Instance.KillProcessTree);
+        return !SettingsManager.Instance.OpenAfterKillAndClose;
+    }
+
+    public override ICommandResult Invoke()
+    {
+        if (KillProcess(_window))
+        {
+            return CommandResult.Dismiss();
+        }
+
+        return CommandResult.KeepOpen();
+    }
+}