The new persistent layer is based on GSettings instead of relying
on an INI file: this will make deployment on Windows easier.
The port to Windows is complete: this includes an installer based
on NSis, the relocation of data relative to the ntdisp-gtk3.exe
directory and a specific widget to select the communication device.
The GTK+3 front-end has been enhanced: the project now has an
official icon and the action selection is performed by a listbox
instead of relying on the current page of a notebook.