Ported GladeWindow to GtkBuilder

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>
Ported FormatDialog to Gtk3

Regression: It is necessary to change the widget to choose
the output file

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>
Port Sort dialog to Gtk3

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>
Move 'set default button' to the action area

Group buttons in one single action area

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>
Port OpenURL dialog to Gtk3

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>
Add ellipsis to menus that open dialogs

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>
Port Search dialog to Gtk3

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>
Port Editor to Gtk3

Signed-off-by: Germán Poo-Caamaño <gpoo@gnome.org>