修复消息没有使用对象池的bug

Unity/Assets/Scripts/Core/Object/MessageObject.cs

@@ -4,7 +4,7 @@ using MongoDB.Bson.Serialization.Attributes;
 
 namespace ET
 {
-    public abstract class MessageObject: ProtoObject, IMessage, IDisposable
+    public abstract class MessageObject: ProtoObject, IMessage, IDisposable, IPool
     {
         public virtual void Dispose()
         {