added dependency for old code for upgrade, removed unused imports

Author: GieziJo

Editor/SOVariantDataAccessor.cs

@@ -1,5 +1,4 @@
 using System.IO;
-using Sirenix.OdinInspector;
 using UnityEditor;
 
 namespace Giezi.Tools

Editor/UpgradeSOVariantHelper.cs

@@ -1,10 +1,6 @@
-using System;
-using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
-using System.Reflection;
 using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
 using UnityEditor;
 using UnityEngine;
 

package.json

@@ -13,6 +13,9 @@
         "ScriptableObject",
         "Variant"
     ],
+    "dependencies": {
+        "com.unity.nuget.newtonsoft-json": "2.0.0"
+    },
     "category": "Editor",
     "type": "Editor"
 }