[geary] (32 commits) Non-fast-forward update to branch wip/20-cert-pinning

[Michael Gratton <mjog src gnome org>]

The branch 'wip/20-cert-pinning' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  30ab021... Update Geary.ConnectivityManager to check a GSocketConnecta
  5358f84... Update Geary.Endpoint API and source
  11f16f7... Tidy up all of the various untrusted_host signals
  f8cf019... Remove now-unsed validation code from Geary.Engine
  3476749... Add Geary.ProblemType for TLS cert validation errors, clari

Commits added to the branch:

  6868e0b... Minor grammar fix (*)
  f767648... Misc non-selectable mailbox fixes (*)
  827db39... Provide common service status tracking via ClientService (*)
  a637a6b... Remove auth failure prompting from the engine (*)
  20447c8... Provide common account and service status tracking via Acco (*)
  62665bf... Set default account and client service status to something  (*)
  e7c6da9... Add initial support for showing/hiding account status as it (*)
  5293960... Rename ClientService.Status.OFFLINE to UNREACHABLE (*)
  f80d041... Add and hook up Retry buttons to service status inforbars a (*)
  0e9f18c... Don't consider service state unknown to be offline (*)
  20a53f2... Rework how auth failures are propagated by the IMAP stack (*)
  34ce1dc... Fix failed IMAP commands being treated as an invalid server (*)
  b74d600... Tidy up Imap.Command API a bit (*)
  2da01b2... Implement client-based password and auth failure status pro (*)
  961d8b4... Tidy up client controller a bit (*)
  3b3528f... Refine handling of errors when opening account (*)
  92353bf... Add Geary.ErrorContext class for passing rich error context (*)
  4ef8105... Show details for status-based service problems (*)
  a641ac1... Restart all effected services with a generic service status (*)
  84a450b... Clear account status UI for an account when it is closed (*)
  7513691... Update Geary.ConnectivityManager to check a GSocketConnecta
  0e22c4e... Update Geary.Endpoint API and source
  d615529... Tidy up all of the various untrusted_host signals
  45c52cd... Remove now-unsed validation code from Geary.Engine
  205b511... Add Geary.ProblemType for TLS cert validation errors, clari
  8d25db3... Modernise cert prompting impl to work with new account stat
  e7889d0... Replace controller's GCR pinning impl with new CertificateM
  e672415... Don't update status for IMAP connection problems multiple t
  bbed4fb... Remove now unsed Endpoint.trust_untrusted_host prop and rel
  d0933f5... Don't block handling GTlsConnection::accept-certificate
  a906dfd... Handle untrusted certs when adding a new account
  9523cdd... Typo fix

(*) This commit already existed in another branch; no separate mail sent