Correct Makefile.am #18
Remove unused type aliases in tetengo2::gui::widget::abstract_window #18
Remove unused type aliases in tetengo2::gui::widget::button #18
Remove unused type aliases in tetengo2::gui::widget::control #18
Remove unused type aliases in tetengo2::gui::widget::custom_control #18
Remove unused type aliases in tetengo2::gui::widget::dialog #18
Remove unused type aliases in tetengo2::gui::widget::dropdown_box #18
Remove unused type aliases in tetengo2::gui::widget::image #18
Remove unused type aliases in tetengo2::gui::widget::label #18
Remove unused type aliases in tetengo2::gui::widget::link_label #18
Remove unused type aliases in tetengo2::gui::widget::list_box #18
Remove unused type aliases in tetengo2::gui::widget::map_box #18
Remove unused type aliases in tetengo2::gui::widget::picture_box #18
Remove unused type aliases in tetengo2::gui::widget::side_bar #18
Remove unused type aliases in tetengo2::gui::widget::text_box #18
Remove unused type aliases of tetengo2::gui::widget::window #18
Modify the type aliases of tetengo2::gui:widget::widget #18