풀링 매니저 생성 및 풀링 기능 구현

- 테스트 프리팹 삭제

Assets/Scripts/Managers/Managers.cs

@@ -6,12 +6,14 @@ public class Managers : MonoBehaviour
     static Managers Instance { get { Init(); return s_instance; } }  // 유일한 매니저를 가져온다.
     
     InputManager _input = new InputManager();
+    PoolManager _pool = new PoolManager();
     ResourceManager _resource = new ResourceManager();
     SceneManagerEx _scene =  new SceneManagerEx();
     SoundManager _sound = new SoundManager();
     UIManager _ui = new UIManager();
     
     public static InputManager Input { get { return Instance._input; } }
+    public static PoolManager Pool { get { return Instance._pool; } }
     public static ResourceManager Resource { get { return Instance._resource; } }
     public static SceneManagerEx Scene { get { return Instance._scene; } }
     public static SoundManager Sound { get { return Instance._sound; } }
@@ -44,6 +46,7 @@ public class Managers : MonoBehaviour
             DontDestroyOnLoad(go);
             s_instance = go.GetComponent<Managers>();
             
+            s_instance._pool.Init();
             s_instance._sound.Init();
         }
     }
@@ -54,5 +57,7 @@ public class Managers : MonoBehaviour
         Input.Clear();
         Scene.Clear();
         UI.Clear();
+        
+        Pool.Clear();
     }
 }