* Make display node, layout spec, and style conform to NSLocking so that users/subclasses can access their locks
* Update the changelog
* Align slashes
* Put it back, when we're in ASDisplayNode
* Go a little further
* Put back the changes I didn't mean to commit
* Kick the CI
* Fix yoga build
* Put back non-locking change
* Address comments from Scott
* Fixed bug where ASVideoNodeDelegate error reporting callback would crash an app because of not responding to selector;
refs #291
* updated changelog.md
* fixed typo in const name of ASVideoNodeDelegate method in delegate flags;
refs #292
* Improve locking situation in ASDisplayNode subclasses
* Adress first number of comments
* Don’t hold the lock while calling _updateComposedTruncationText