TODO
====

Support return values and ref/out parameters

Complete GObject support including macros and GType, taking into account
inheritance etc.

Enums, delegates, events etc.

generate autoconf/automake build files. set AC_VERSION using the assembly's
version attribute

Automatically generate inline API documentation using documentation in the
Monodoc format. The GTK+ API documentation generator can then be used to create
documentation familiar to GTK+ developers.

Resolve GC issues using weak references or storing objects in something like a
MonoGHashTable

Wish: pass in a GtkWidget*, managed gets Gtk.Widget
