Deltachat

- always describe the context of the displayed error 1451

- do not emit `DC_EVENT_ERROR` when message sending fails;
`dc_msg_get_state()` and `dc_get_msg_info()` are sufficient 1451

- new config-option `media_quality` 1449

- try over if writing message to database fails 1447

- expunge deleted messages 1440

- do not send `DC_EVENT_MSGS_CHANGED|INCOMING_MSG` on hidden messages 1439

- new config options `delete_device_after` and `delete_server_after`,
each taking an amount of seconds after which messages
are deleted from the device and/or the server 1310 1335 1411 1417 1423

- new api `dc_estimate_deletion_cnt()` to estimate the effect
of `delete_device_after` and `delete_server_after`

- use Ed25519 keys by default, these keys are much shorter
than RSA keys, which results in saving traffic and speed improvements 1362

- improve message ellipsizing 1397 1430

- emit `DC_EVENT_ERROR_NETWORK` also on smtp-errors 1378

- do not show badly formatted non-delta-messages as empty 1384

- try over SMTP on potentially recoverable error 5.5.0 1379

- remove device-chat from forward-to-chat-list 1367

- improve group-handling 1368

- `dc_get_info()` returns uptime (how long the context is in use)

- python improvements and adaptions 1408 1415

- log to the stdout and stderr in tests 1416

- refactoring, code improvements 1363 1365 1366 1370 1375 1389 1390 1418 1419

- removed api: `dc_chat_get_subtitle()`, `dc_get_version_str()`, `dc_array_add_id()`

- removed events: `DC_EVENT_MEMBER_ADDED`, `DC_EVENT_MEMBER_REMOVED`

- new flag DC_GCL_FOR_FORWARDING for dc_get_chatlist()
that will sort the "saved messages" chat to the top of the chatlist 1336
- mark mails as being deleted from server in dc_empty_server() 1333
- fix interaction with servers that do not allow folder creation on root-level;
use path separator as defined by the email server 1359
- fix group creation if group was created by non-delta clients 1357
- fix showing replies from non-delta clients 1353
- fix member list on rejoining left groups 1343
- fix crash when using empty groups 1354
- fix potential crash on special names 1350

- handle keys reliably on armv7 1327

- change generated key type back to RSA as shipped versions
have problems to encrypt to Ed25519 keys

- update rPGP to encrypt reliably to Ed25519 keys;
one of the next versions can finally use Ed25519 keys then