This update replaces widgets (from widget.el and wid-edit.el) with buttons (from button.el). This is not a functional change and should be largely imperceptible to users, though it should make rendering the Deft buffer a little bit faster. As it says in the documentation of button.el:

> the button package has the advantage that it is (1) much faster, (2) much smaller, and (3) much, much, simpler (the code, that is, not the interface).