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/Helpers/SettingsManager.cs

@@ -0,0 +1,128 @@
+// 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.IO;
+using Microsoft.CmdPal.Ext.WindowWalker.Properties;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+
+namespace Microsoft.CmdPal.Ext.WindowWalker.Helpers;
+
+public class SettingsManager : JsonSettingsManager
+{
+    private static readonly string _namespace = "windowWalker";
+
+    private static string Namespaced(string propertyName) => $"{_namespace}.{propertyName}";
+
+    private static SettingsManager? instance;
+
+    private readonly ToggleSetting _resultsFromVisibleDesktopOnly = new(
+        Namespaced(nameof(ResultsFromVisibleDesktopOnly)),
+        Resources.windowwalker_SettingResultsVisibleDesktop,
+        Resources.windowwalker_SettingResultsVisibleDesktop,
+        false);
+
+    private readonly ToggleSetting _subtitleShowPid = new(
+        Namespaced(nameof(SubtitleShowPid)),
+        Resources.windowwalker_SettingTagPid,
+        Resources.windowwalker_SettingTagPid,
+        false);
+
+    private readonly ToggleSetting _subtitleShowDesktopName = new(
+        Namespaced(nameof(SubtitleShowDesktopName)),
+        Resources.windowwalker_SettingTagDesktopName,
+        Resources.windowwalker_SettingSubtitleDesktopName_Description,
+        true);
+
+    private readonly ToggleSetting _confirmKillProcess = new(
+        Namespaced(nameof(ConfirmKillProcess)),
+        Resources.windowwalker_SettingConfirmKillProcess,
+        Resources.windowwalker_SettingConfirmKillProcess,
+        true);
+
+    private readonly ToggleSetting _killProcessTree = new(
+        Namespaced(nameof(KillProcessTree)),
+        Resources.windowwalker_SettingKillProcessTree,
+        Resources.windowwalker_SettingKillProcessTree_Description,
+        false);
+
+    private readonly ToggleSetting _openAfterKillAndClose = new(
+        Namespaced(nameof(OpenAfterKillAndClose)),
+        Resources.windowwalker_SettingOpenAfterKillAndClose,
+        Resources.windowwalker_SettingOpenAfterKillAndClose_Description,
+        false);
+
+    private readonly ToggleSetting _hideKillProcessOnElevatedProcesses = new(
+        Namespaced(nameof(HideKillProcessOnElevatedProcesses)),
+        Resources.windowwalker_SettingHideKillProcess,
+        Resources.windowwalker_SettingHideKillProcess,
+        false);
+
+    private readonly ToggleSetting _hideExplorerSettingInfo = new(
+        Namespaced(nameof(HideExplorerSettingInfo)),
+        Resources.windowwalker_SettingExplorerSettingInfo,
+        Resources.windowwalker_SettingExplorerSettingInfo_Description,
+        true);
+
+    private readonly ToggleSetting _inMruOrder = new(
+        Namespaced(nameof(InMruOrder)),
+        Resources.windowwalker_SettingInMruOrder,
+        Resources.windowwalker_SettingInMruOrder_Description,
+        true);
+
+    public bool ResultsFromVisibleDesktopOnly => _resultsFromVisibleDesktopOnly.Value;
+
+    public bool SubtitleShowPid => _subtitleShowPid.Value;
+
+    public bool SubtitleShowDesktopName => _subtitleShowDesktopName.Value;
+
+    public bool ConfirmKillProcess => _confirmKillProcess.Value;
+
+    public bool KillProcessTree => _killProcessTree.Value;
+
+    public bool OpenAfterKillAndClose => _openAfterKillAndClose.Value;
+
+    public bool HideKillProcessOnElevatedProcesses => _hideKillProcessOnElevatedProcesses.Value;
+
+    public bool HideExplorerSettingInfo => _hideExplorerSettingInfo.Value;
+
+    public bool InMruOrder => _inMruOrder.Value;
+
+    internal static string SettingsJsonPath()
+    {
+        var directory = Utilities.BaseSettingsPath("Microsoft.CmdPal");
+        Directory.CreateDirectory(directory);
+
+        // now, the state is just next to the exe
+        return Path.Combine(directory, "settings.json");
+    }
+
+    public SettingsManager()
+    {
+        FilePath = SettingsJsonPath();
+
+        Settings.Add(_resultsFromVisibleDesktopOnly);
+        Settings.Add(_subtitleShowPid);
+        Settings.Add(_subtitleShowDesktopName);
+        Settings.Add(_confirmKillProcess);
+        Settings.Add(_killProcessTree);
+        Settings.Add(_openAfterKillAndClose);
+        Settings.Add(_hideKillProcessOnElevatedProcesses);
+        Settings.Add(_hideExplorerSettingInfo);
+        Settings.Add(_inMruOrder);
+
+        // Load settings from file upon initialization
+        LoadSettings();
+
+        Settings.SettingsChanged += (s, a) => this.SaveSettings();
+    }
+
+    internal static SettingsManager Instance
+    {
+        get
+        {
+            instance ??= new SettingsManager();
+            return instance;
+        }
+    }
+}