Inspector拡張でEditorのScript表示

[CustomEditor(typeof(Hoge))]
public class HogeEditor : Editor
{
    public override void OnInspectorGUI()
    {
        MonoScript script = MonoScript.FromScriptableObject(this);
        script = EditorGUILayout.ObjectField(script, typeof(MonoScript), false) as MonoScript;

とやればEditor自体もScriptに出せる。 EditorもScriptableObjectの派生のようだ https://anchan828.github.io/editor-manual/web/scriptableobject.html