* Add cache implementation
* Remove old ASEqualityHashHelpers
* Some more ASEquality and ASEqualityHashHelper cleanup
* Add cache for text renderer in ASTextNode
* Move from C++ LRU renderer cache to NSCache based renderer cache
* [ASTextNode] Fix highlighting when textContainerInsets are set.
* Add ASTextNodeSnapshotTests to xcodeproj.
* Add snapshot test for container inset and highlighting.