core: Extend gpgme_key_sig_t with trust signature members.
* src/gpgme.h.in (struct _gpgme_key_sig): Add fields 'trust_depth', 'trust_value', and 'trust_scope'. * src/key.c (gpgme_key_unref): Free trust_scope. * src/keylist.c (keylist_colon_handler): Set the fields. * tests/run-keylist.c (main): Print the fields.
The trust signature values are part of gpg's output since the year 2003.
This now adds support to gpgme.