AppKit: more notifications
AppKit: more notifications

- NSScroller:
  - NSPreferredScrollerStyleDidChangeNotification
- NSView:
  - NSViewFrameDidChangeNotification
  - NSViewFocusDidChangeNotification
  - NSViewBoundsDidChangeNotification
  - NSViewGlobalFrameDidChangeNotification
  - NSViewDidUpdateTrackingAreasNotification

PlayScriptRedux/monomac,dlech/monomac