Oxygen

• Adds timeout operator to PrimitiveSequence (Single, Maybe, Observable)
• Adds delay operator to SharedSequence.
• Adds andThen operator to Completeable.
• Adds concat operator to Completeable.
• Adds RxPickerViewDataSourceType
• Adds UIPickerView extensions:
  • modelSelected
  • itemTitles
  • itemAttributedTitles
  • items
• Adds UITableView extensions:
  • modelDeleted
• Adds UICollectionView extensions:
  • itemHighlighted
  • itemUnhighlighted
  • willDisplayCell
  • didEndDisplayingCell
  • willDisplaySupplementaryView
  • didEndDisplayingSupplementaryView
• Adds UIScrollView extensions:
  • willBeginDecelerating
  • willBeginDragging
  • willBeginZooming
  • didEndZooming

Anomalies

• Fixes deadlock anomaly in shareReplayWhileLatest. #1323
• Removes duplicated events swallowing in NSControl on macOS.