Improvements to the NSView adaptor system + Implemented UITextViewDelegate
It's now possible to have more than one UIAppKitView per window + Added UIMacWindowButtonsView
Some fixes to UINavigationBar
Implemented first chunk of UIToolbar. There is currently no appearance support in it and UIBarPositioning is completely unimplemented
<< Previous commit contained several improvements to UIBarButtonItem ... Removed remaining vestiges of first attempt at implementing UIAppearance