Release Candidate v0.8.5-rc.1

[epilys]

Release candidate for v0.8.5.

Major differences:

• Replaced TUI (termnal screen interface drawing) with new code that
  makes sure out of bounds accesses are as little as possible. Also
  every area of a screen holds provenance; you cannot mix area/region
  information of different screens (virtual or tty). Every time there is
  a window resize, the screen's generation gets refreshed.
• Fixed some imap flag sync issues.
• Many small refactors across all the codebase.

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This discussion was created from the release Release Candidate v0.8.5-rc.1.