* 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
* Add "ASGraphicsContext" to skip copying our rendered images
* Zero the buffer before making a context
* Update license header
* Update dangerfile
* Make it a runtime flag
* Restore GState for good measure
* Free buffer if end without image
* Enable the experiment, and cut out the middle-man
* Fix typo
* Need to check availability before use of macros.
* Get rid of PCH and enforce macro definition.
* Remove prefix
* Switch to global warning instead, much better.