1.组合节点全部添加记忆功能;

2.优化并行节点和随机选择节点的逻辑;
3.修复随机选择节点和并行节点关闭时,子节点不能正确关闭的bug

bt-demo/assets/scene/GameEntry.scene

@@ -202,7 +202,10 @@
     "skeleton": {
       "__id__": 6
     },
-    "btConfig": null,
+    "btConfig": {
+      "__uuid__": "c8aeef5d-6d0e-4093-848e-7d8f1ca30261",
+      "__expectedType__": "cc.JsonAsset"
+    },
     "_id": "69LhmWaZRIUpmYvdiN82Ha"
   },
   {
@@ -226,11 +229,11 @@
       "a": 255
     },
     "_skeletonData": {
-      "__uuid__": "39a7d8cd-533a-479a-b909-9575bf720338",
+      "__uuid__": "6aa6ec55-2434-467e-becb-934b6411ff37",
       "__expectedType__": "sp.SkeletonData"
     },
     "defaultSkin": "default",
-    "defaultAnimation": "idle",
+    "defaultAnimation": "zoulu",
     "_premultipliedAlpha": true,
     "_timeScale": 1,
     "_preCacheMode": 0,
@@ -304,13 +307,13 @@
     "__prefab": null,
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 419.8399963378906,
-      "height": 686.0800170898438
+      "width": 606,
+      "height": 398.8900146484375
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
-      "x": 0.45412539378136013,
-      "y": 0.011660447470739235
+      "x": 0.2154950434618657,
+      "y": 0.07997191819064561
     },
     "_id": "c9XaAZS6pNILxWx4jmSYKE"
   },