Introduce Property<T> to simplify preferences system
Group import/export callbacks
Callback: cleanup
Callback: remove fixed-arity wrappers
Callback: work at any arity
Embrace lambdas
Wrap more GTK
GTK: wrap gtk_widget_set_size_request
Wrap more GTK
Wrap more GTK
GTK: wrap gtk_table_attach
Wrap more GTK
GTK: wrap GTK_WIDGET
GTK: wrap gtk_widget_show
GTK: wrap gtk_box_pack_start
Wrap more GTK