Dex is a library supporting "Deferred Execution" with the explicit
goal of integrating with GNOME and GTK-based applications.
It provides primatives for supporting futures in a variety of ways
with both read-only and writable views. Additionally, integration
with existing asynchronous-based APIs is provided through the use
of wrapper promises.
"Fibers" are implemented which allows for writing synchronous
looking code which calls asynchronous APIs from GIO underneath.