(client) feat:右键菜单全局与UI分离，Building生成支持，双层地图重写

Client/Assets/Scripts/Prefab/RightMenuPrefab.cs

@@ -5,7 +5,7 @@ using UnityEngine.EventSystems;
 
 namespace Prefab
 {
-    public class RightMenuPrefab: Utils.MonoSingleton<RightMenuPrefab>,IPointerExitHandler
+    public class RightMenuPrefab: MonoBehaviour,IPointerExitHandler
     {
         public GameObject menu;
         public ButtonPrefab buttonPrefab;
@@ -76,11 +76,6 @@ namespace Prefab
                 Destroy(child.gameObject);
             }
         }
-        protected override void OnStart()
-        {
-            Hide();
-        }
-
         public void OnPointerExit(PointerEventData eventData)
         {
             Hide();