cocoa Package Functions

The cocoa package is LispWorks 8.1's COCOA: the four Foundation structures objc:invoke converts, their setters, cocoa:ns-not-found and the notification observers. It is macOS only and not part of Common Lisp. A structure is the Lisp value objc:invoke passes and answers for it -- a vector #(x y) for NSPoint, #(width height) for NSSize, #(x y width height) for NSRect (all doubles) and a cons (location . length) for NSRange -- or a foreign object of the type (fli), whose slots are x y, width height, origin size and location length. The setters fill either. The symbols cocoa:ns-point, cocoa:ns-size, cocoa:ns-rect and cocoa:ns-range name the structures in a list-form method's types and in objc:objc-class-method-signature's answer ((:struct cocoa:ns-range)), and cocoa:ns-not-found is NSNotFound, 9223372036854775807.