closed #4060:fixed Label wasn't implemented correctly when Label::_fontAtlas contains multiple texture.
replace [auto] with [const auto&] in FOR loop.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into new_label
update XCode project for add miss file on Mac and IOS.
Merge pull request #5378 from Dhilan007/develop_label_multiilTexture

closed #4060:fixed Label wasn't implemented correctly when Label::_fontAtlas contains multiple texture.