Add a menu "Open www.tetengo.org"
Create bobura::command::open_www_tetengo_org
Merge branch 'master' into weblink
Merge branch 'master' into weblink
Create tetengo2::gui::shell
Create tetengo2::gui::shell::instance()
Create tetengo2::gui::shell::execute()
Implement bobura::command::open_www_tetengo_org::execute()
Implement tetengo2::detail::windows::shell
Replace the way to open a link to tetengo2::gui::shell
Merge branch 'weblink'