Swift and Interface Builder happiness
- Adds annotations for nullability and generics to ease Swift import.
- Fixes a couple Interface Builder issues:
- Flag the delegate as an IBOutlet so it can be assigned.
- Fix text being cleared/unset if only set via the IB editor.
- Fixes text alignments other than left set on the label rather than via NSParagraphStyle.
- Fixes VoiceOver element positions when placed inside a UIScrollView.