Tons of V2 API doc fixes (#3932)

* Tons of API doc updates

* tweaked scenario

* try to fix unit test crash in ubuntu action

* try to fix unit test crash in ubuntu action2

UICatalog/Scenarios/CharacterMap/CharacterMap.cs

@@ -14,9 +14,6 @@ namespace UICatalog.Scenarios;
 ///     "Character Map" application (like Windows' charmap.exe). - Helps test unicode character rendering in Terminal.Gui -
 ///     Illustrates how to do infinite scrolling
 /// </summary>
-/// <remarks>
-///     See <see href="CharacterMap/README.md"/>.
-/// </remarks>
 [ScenarioMetadata ("Character Map", "Unicode viewer. Demos infinite content drawing and scrolling.")]
 [ScenarioCategory ("Text and Formatting")]
 [ScenarioCategory ("Drawing")]

UICatalog/Scenarios/CharacterMap/README.md

@@ -1,11 +0,0 @@
-# CharacterMap Scenario Deep Dive
-
-The CharacterMap Scenario is an example of the following Terminal.Gui concepts:
-
-- **Complex and High-Performnt Drawing** - 
-- **Virtual Content Scrolling** -
-- **Advanced ScrollBar Control** -
-- **Unicode wide-glyph Rendering** -
-- **Advanced Layout** -
-- **Cursor Management** -
-- **Context Menu** - 

UICatalog/Scenarios/Clipping.cs

@@ -9,6 +9,7 @@ namespace UICatalog.Scenarios;
 [ScenarioCategory ("Layout")]
 [ScenarioCategory ("Arrangement")]
 [ScenarioCategory ("Tests")]
+[ScenarioCategory ("Drawing")]
 public class Clipping : Scenario
 {
     private int _hotkeyCount;

UICatalog/Scenarios/Editors/EventLog.cs

@@ -10,7 +10,6 @@ namespace UICatalog.Scenarios;
 /// </summary>
 /// <remarks>
 /// </remarks>
-/// </example>
 public class EventLog : ListView
 {
     public EventLog ()

UICatalog/UICatalog.cs

@@ -1,11 +1,9 @@
 global using Attribute = Terminal.Gui.Attribute;
-global using CM = Terminal.Gui.ConfigurationManager;
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.CommandLine;
 using System.CommandLine.Builder;
-using System.CommandLine.Help;
 using System.CommandLine.Parsing;
 using System.Data;
 using System.Diagnostics;
@@ -18,10 +16,7 @@ using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.Json;
 using System.Text.Json.Serialization;
-using System.Threading;
-using System.Threading.Tasks;
 using Terminal.Gui;
-using UICatalog.Scenarios;
 using static Terminal.Gui.ConfigurationManager;
 using Command = Terminal.Gui.Command;
 using RuntimeEnvironment = Microsoft.DotNet.PlatformAbstractions.RuntimeEnvironment;