Remove unused namespace

Author: IrishBruse

LDtk.Codegen/LDtkJsonFull.cs

@@ -6,7 +6,6 @@ namespace LDtk.Codegen;
 // LDtk 1.5.3
 
 using System;
-using System.Collections.Generic;
 using System.Text.Json.Serialization;
 
 using Microsoft.Xna.Framework;

LDtk.JsonSchema/Program.cs

@@ -18,7 +18,6 @@ public static class Program
 
     static readonly string[] Namespaces = {
         "using System;",
-        "using System.Collections.Generic;",
         "using System.Text.Json.Serialization;",
         "",
         "using Microsoft.Xna.Framework;",

LDtk/LDtkJson.cs

@@ -6,7 +6,6 @@ namespace LDtk;
 // LDtk 1.5.3
 
 using System;
-using System.Collections.Generic;
 using System.Text.Json.Serialization;
 
 using Microsoft.Xna.Framework;