1.Fix crash bug when using unknown character
2.Fix text align mistake
1.add label crash test
2.fix lose char when label have unknown character.
fixed #3683. fixed convertToWorldSpaceAR of CCSkin returning error coordinate
update subtitle.
Merge pull request #5084 from andyque/develop

closed #3683. fixed convertToWorldSpaceAR of CCSkin returning error coordinate. This PR fixes that TestColliderDetector not working
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Merge pull request #5082 from Dhilan007/develop_label

closed #3726:Fix crash when using unknown character.
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Merge remote-tracking branch 'upstream/develop' into develop