Boxes - Hardening Sprint, GtkAssistant and MIME-types Integration

by Adrien Plazas for GNOME

The goal of this project is to polish Boxes to make it as close to perfection as possible. To achieve this, I'll: - port its installation wizard to GtkAssistant and polishing it, - improve its usage of MIME-types, - try to find as much undiscovered bugs as I can, - polish the GUI and get rid of as much small bugs as possible in the form of a hardening sprint, - add tests for the bugs I fix.