issue #3863:Rename the lua binding of the `registerScriptHandler` and  `unregisterScriptHandler` of the SkeletonAnimation

1.Because the lua binding of the registerScriptHandler and unregisterScriptHandler of the SkeletonAnimation will override the lua binding of the registerScriptHandler and unregisterScriptHandler of the Node,so rename registerScriptHandler to registerSpineEventHandler and unregisterScriptHandler to registerSpineEventHandler
2.fix:Resolve the compile error of the cast_type on vs