swift234

API Notes: Commit API Notes v13 (with copyWithZone returning N)

This drop adds 3 new frameworks: Metal, SceneKit, and SpriteKit.
The other frameworks (Foundation, CoreData, ObjectiveC, UIKit) have been refined:
 - conflicting items went to unknowns,
 - bugs got fixed,
 - more auditing has been performed.

Swift SVN r21443