glibmm 2.56.0

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- ACCES : Glib::SpawnError
- ACCESS_DENIED : Gio::DBus::Error , Glib::FileError
- ADDRESS_IN_USE : Gio::DBus::Error , Gio::Error
- ADT_AUDIT_DATA_UNKNOWN : Gio::DBus::Error
- AGAIN : Glib::ThreadError , Glib::Threads::ThreadError
- ALREADY_MOUNTED : Gio::Error
- APRIL : Glib::Date
- ASSERTION_EXPECTED : Glib::RegexError
- AUGUST : Glib::Date
- AUTH_FAILED : Gio::DBus::Error