* Add tests for baseline alignments
* Merge baseline alignment algorithm to the main stack algorithm
- Baseline alignment is now part of the main stack algorithm.
- ASStackBaselinePositionedLayout is no longer needed and removed.
* All snapshot test cases of ASStackLayoutSpec are passing now
* Remove baselineRelativeArrangement
* Remove TODO
* Minor fixes in cross size determination step
* Initial commit for ASStackLayoutSpec improvements
* Remove the lock in ASStackLayoutSpec and make the ASStackLayoutSpecStyle const
I think we don't need lock here as the style already has a lock while we set the value
* Add ASStackLayoutSpecItem that replaces layout specific items
* Prevent baseline pass if not needed
* Update comments
- The code is forked from LayoutComponents in ComponentKit.
- Public interfaces are modified to be strictly Objective-C. As a result, users are not forced to switch to Objective-C++, the linker can happily compile and Swift fans can continue using the mighty ASDK.