Add prop IToolApi.AvailableTools and use in ClientLuaLibrary

src/BizHawk.Client.Common/Api/Interfaces/IToolApi.cs

@@ -1,8 +1,11 @@
 using System;
+using System.Collections.Generic;
+
 namespace BizHawk.Client.Common
 {
 	public interface IToolApi : IExternalApi
 	{
+		IEnumerable<Type> AvailableTools { get; }
 		Type GetTool(string name);
 		object CreateInstance(string name);
 		void OpenCheats();

src/BizHawk.Client.EmuHawk/Api/Libraries/ToolApi.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 
 using BizHawk.Client.Common;
@@ -8,6 +9,8 @@ namespace BizHawk.Client.EmuHawk
 {
 	public sealed class ToolApi : IToolApi
 	{
+		public IEnumerable<Type> AvailableTools => GlobalWin.Tools.AvailableTools.ToList(); // defensive copy in case ToolManager's implementation changes
+
 		public Type GetTool(string name)
 		{
 			var toolType = Util.GetTypeByName(name).FirstOrDefault(x => typeof(IToolForm).IsAssignableFrom(x) && !x.IsInterface);

src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/ClientLuaLibrary.cs

@@ -295,7 +295,7 @@ namespace BizHawk.Client.EmuHawk
 
 		[LuaMethodExample("local nlcliget = client.getavailabletools( );")]
 		[LuaMethod("getavailabletools", "Returns a list of the tools currently open")]
-		public LuaTable GetAvailableTools() => GlobalWin.Tools.AvailableTools.Select(tool => tool.Name.ToLower()).EnumerateToLuaTable(Lua);
+		public LuaTable GetAvailableTools() => APIs.Tool.AvailableTools.Select(tool => tool.Name.ToLower()).EnumerateToLuaTable(Lua);
 
 		[LuaMethodExample("local nlcliget = client.gettool( \"Tool name\" );")]
 		[LuaMethod("gettool", "Returns an object that represents a tool of the given name (not case sensitive). If the tool is not open, it will be loaded if available. Use gettools to get a list of names")]