[fxcop] Fixes for Wox.Plugin (1of3) (#7457)

* Added CultureInfo (CA1307: Specify StringComparison for clarity / CA1304: Specify CultureInfo)

* Check arguments and throw ArgumentNullException (CA1062: Validate arguments of public methods)

* Changed url parameter from string to System.Uri and added null checks (CA1054: URI parameters should not be strings)

* Rethrow exception without specifying the exception explicitly (CA2200: Rethrow to preserve stack details)

* Changed from Collection property to methods for PluginMetadata::ActionKeywords (CA2227: Collection properties should be read only)

* Changed from Collection property to methods for Result::GetTitleHighlightData (CA2227: Collection properties should be read only)

* Made Collection property read-only and added parameter in constructor for Result::SubTitleHighlightData (CA2227: Collection properties should be read only)

* Made Collection property read only and added parameter in constructor for ResultUpdatedEventArgs::Results (CA2227: Collection properties should be read only)

* CA1507: Use nameof in place of string

* Removed initialization for ThemeManager::_disposed (CA1805: Do not initialize unnecessarily)

* Changed Query::Terms array property to ReadOnlyCollection and added private set (CA1819: Properties should not return arrays)

* CA1060: Move P/Invokes to NativeMethods class

* CA1806: Do not ignore method results

* CA2101: Specify marshaling for P/Invoke string arguments

* Removed unnecessary empty interface IFeatures (CA1040: Avoid empty interfaces)

- Removed IFeatures interface and references
- Renamed IFeatures.cs to IContextMenu.cs according to guidelines

* Added comments for CultureInfo (CA1307: Specify StringComparison for clarity / CA1304: Specify CultureInfo)

* Added localization for Wox.Plugin and localized strings in FilesFolders.cs

src/modules/launcher/Wox.Plugin/IContextMenu.cs

@@ -0,0 +1,30 @@
+// 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.Collections.Generic;
+
+namespace Wox.Plugin
+{
+    public interface IContextMenu
+    {
+        List<ContextMenuResult> LoadContextMenus(Result selectedResult);
+    }
+
+    /// <summary>
+    /// Represent plugins that support internationalization
+    /// </summary>
+    public interface IPluginI18n
+    {
+        string GetTranslatedPluginTitle();
+
+        string GetTranslatedPluginDescription();
+    }
+
+    public interface IResultUpdated
+    {
+        event ResultUpdatedEventHandler ResultsUpdated;
+    }
+
+    public delegate void ResultUpdatedEventHandler(IResultUpdated sender, ResultUpdatedEventArgs e);
+}