Deltachat

- fix chatlist.get_msg_id to return id, instead of wrongly erroring

- fix dc_get_msg() to return empty messages when asked for special ones

- fix more than one sending of autocrypt setup message

- fix recognition of mailto-address-qr-codes, add tests

- tune down error to warning when adding self to chat

- add back `dc_empty_server()` 682

- if `show_emails` is set to `DC_SHOW_EMAILS_ALL`,
email-based contact requests are added to the chatlist directly

- fix IMAP hangs 717 and cleanups

- several rPGP fixes

- code streamlining and rustifications

- https://c.delta.chat docs are now regenerated again through our CI

- several rPGP cleanups, security fixes and better multi-platform support

- reconnect on io errors and broken pipes (imap)

- probe SMTP with real connection not just setup

- various imap/smtp related fixes

- use to_string_lossy in most places instead of relying on valid utf-8
encodings

- rework, rustify and test autoconfig-reading and parsing

- some rustifications/boolifications of c-ints

- first beta of the Delta Chat Rust core library. many fixes of crashes
and other issues compared to 1.0.0-alpha.5.

- Most code is now "rustified" and does not do manual memory allocation anymore.

- The `DC_EVENT_GET_STRING` event is not used anymore, removing the last
event where the core requested a return value from the event callback.

Please now use `dc_set_stock_translation()` API for core messages
to be properly localized.

- Deltachat FFI docs are automatically generated and available here:
https://c.delta.chat

- New events ImapMessageMoved and ImapMessageDeleted

For a full list of changes, please see our closed Pull Requests:

https://github.com/deltachat/deltachat-core-rust/pulls?q=is%3Apr+is%3Aclosed