void OnEnable()
        {
            _target  = this.target as JPhysicsSetting;
            _gravity = serializedObject.FindProperty("_gravity");

            this.InitCollisionLayerMasks();
        }
 private void Awake()
 {
     this.setting = Instantiate(Resources.Load <JPhysicsSetting>("JPhysics Settings"));
     this.StartCoroutine(UpdateCollisions());
 }