Docs

• Added SelectorManager module documentation
• Added Selector API documentation
• Added State API documentation
• Improved SelectorManager API documentation

Added

• Added new methods to SelectorManager API
• Added new methods to Selector API
• Added getChildAt(index) and getLastChild to Component API
• Track component Selectors in UndoManager #3879

Fixed

• Fixed SVG parsing #3866
• Fixed next/prev selection #3861
• Fixed color picker input update with missing hex #3883
• Fixed headless option #3672 (reply in thread)