Ability to Delete Applications

Submitted by Drew Henry

Assigned to Simon Steinbeiß @ochosi

Link to original bug (#13975)

Description

Currently the applications that are listed in the settings includes every application that has ever sent a notification. This includes applications that I have since uninstalled as well as names that I created while testing notify-send that don't actually belong to any application. It would be helpful, then, to have the option to delete applications from the list.

Version: 0.4.0