Merge pull request #5246 from samuele3hu/developBug

issue #3863:Rename the lua binding of the `registerScriptHandler` and  `unregisterScriptHandler` of the SkeletonAnimation
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closed #3867: "Testing empty labels" in LabelTest crashes on Linux platform.
Merge pull request #5249 from minggo/develop

[ci skip]update changelog
Merge pull request #5250 from dumganhar/iss3867-linux-empty-string-crash

closed #3867: "Testing empty labels" in LabelTest crashes on Linux platform.
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