fix: Fixes spawners, adds convertpremiumspawners, exportspawners, and replaces with neruns distro (#751)

### Additions
* Adds `[exportspawners <relative json file path to distro>`
  * If no path is provided, it will be saved to the `Data\Spawns` folder with the current timestamp as the file name.
  * Supports global, facet, region, multi, and area
* Fixes client disconnect for bad spawner generation command.
* Moves spawner commands to their own folder.
* Adds GUIDs for spawners. This allows for easy replacement during import to reduce duplication.
* Allows exporting the name of the spawner.
* Fixes globbing when using [generatespawners
* Adds [convertpremiumspawners to convert Premium Spawners (from Neruns distro)

Possibly in .NET 6 serializing JSON will be more performant using JSON nodes.


### Screenshots
![Screen_Shot_2021-08-31_at_10 20 06_PM](https://user-images.githubusercontent.com/3953314/131618495-cf7e3ae5-58e5-4f86-9d3c-3cc49906d9fc.png)
![Screen_Shot_2021-08-31_at_10 21 08_PM](https://user-images.githubusercontent.com/3953314/131618502-c39cc368-2266-47a5-9b87-e5ffa108b875.png)
![Screen_Shot_2021-08-31_at_10 13 29_PM](https://user-images.githubusercontent.com/3953314/131618512-f9807f1b-76e4-4503-989d-42324798fbf5.png)

Projects/UOContent/Engines/Spawners/Commands/ExportSpawnersCommand.cs

@@ -0,0 +1,93 @@
+/*************************************************************************
+ * ModernUO                                                              *
+ * Copyright 2019-2021 - ModernUO Development Team                       *
+ * Email: hi@modernuo.com                                                *
+ * File: ExportSpawnersCommand.cs                                        *
+ *                                                                       *
+ * This program is free software: you can redistribute it and/or modify  *
+ * it under the terms of the GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3 of the License, or     *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * You should have received a copy of the GNU General Public License     *
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+using System.Collections.Generic;
+using System.IO;
+using Server.Commands.Generic;
+using Server.Json;
+using Server.Network;
+
+namespace Server.Engines.Spawners
+{
+    public class ExportSpawnersCommand : BaseCommand
+    {
+        public static void Initialize()
+        {
+            TargetCommands.Register(new ExportSpawnersCommand());
+        }
+
+        public ExportSpawnersCommand()
+        {
+            AccessLevel = AccessLevel.GameMaster;
+            Supports = CommandSupport.AllItems & ~CommandSupport.Contained;
+            Commands = new[] { "ExportSpawners" };
+            ObjectTypes = ObjectTypes.Items;
+            Usage = "ExportSpawners";
+            Description = "Exports the given the spawners to the a file";
+            ListOptimized = true;
+        }
+
+        public override void ExecuteList(CommandEventArgs e, List<object> list)
+        {
+            var path = e.Arguments.Length == 0 ? null : e.Arguments[0].Trim();
+
+            if (string.IsNullOrEmpty(path))
+            {
+                path = Path.Combine(Core.BaseDirectory, $"Data/Spawns/{Utility.GetTimeStamp()}.json");
+            }
+            else
+            {
+                var directory = Path.GetDirectoryName(Path.GetFullPath(path!))!;
+                if (!Path.IsPathRooted(path))
+                {
+                    path = Path.Combine(Core.BaseDirectory, path);
+                    AssemblyHandler.EnsureDirectory(directory);
+                }
+                else if (!Directory.Exists(directory))
+                {
+                    LogFailure("Directory doesn't exist.");
+                    return;
+                }
+            }
+
+            NetState.FlushAll();
+
+            var options = JsonConfig.GetOptions(new TextDefinitionConverterFactory());
+
+            var spawnRecords = new List<DynamicJson>(list.Count);
+            for (var i = 0; i < list.Count; i++)
+            {
+                if (list[i] is BaseSpawner spawner)
+                {
+                    var dynamicJson = DynamicJson.Create(spawner.GetType());
+                    spawner.ToJson(dynamicJson, options);
+                    spawnRecords.Add(dynamicJson);
+                }
+            }
+
+            if (spawnRecords.Count == 0)
+            {
+                LogFailure("No matching spawners found.");
+                return;
+            }
+
+            e.Mobile.SendMessage("Exporting spawners...");
+
+            JsonConfig.Serialize(path, spawnRecords, options);
+
+            e.Mobile.SendMessage($"Spawners exported to {path}");
+        }
+    }
+}