升级引擎到 2.3.3 加入shader实现的loading动画

assets/migration/use_reversed_rotateBy.js

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+/*
+ * This script is automatically generated by Cocos Creator and is only used for projects compatible with v2.1.0/v2.1.1/v2.3.0/v2.3.1/v2.3.2 versions.
+ * You do not need to manually add this script in any other project.
+ * If you don't use cc.Action in your project, you can delete this script directly.
+ * If your project is hosted in VCS such as git, submit this script together.
+ *
+ * 此脚本由 Cocos Creator 自动生成，仅用于兼容 v2.1.0/v2.1.1/v2.3.0/v2.3.1/v2.3.2 版本的工程，
+ * 你无需在任何其它项目中手动添加此脚本。
+ * 如果你的项目中没用到 Action，可直接删除该脚本。
+ * 如果你的项目有托管于 git 等版本库，请将此脚本一并上传。
+ */
+
+cc.RotateBy._reverse = true;

assets/migration/use_reversed_rotateBy.js.meta

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+{
+  "ver": "1.0.8",
+  "uuid": "c9410158-f845-485b-a354-cbe3452ece6e",
+  "isPlugin": false,
+  "loadPluginInWeb": true,
+  "loadPluginInNative": true,
+  "loadPluginInEditor": false,
+  "subMetas": {}
+}