Release 1.8.3

* [CritFix] Make flags mutually exclusive for mime parts
* [CritFix] Strictly deny unencoded bad utf8 sequences in headers
* [Feature] Add Kaspersky antivirus support
* [Feature] Add method to get dkim results
* [Feature] Add more words regexp classes
* [Feature] Allow to choose words format in `rspamadm mime`
* [Feature] Allow to get all types of words from Lua
* [Feature] Allow to get task flags in C expressions
* [Feature] Allow to require encryption when accepting connections
* [Feature] Ignore bogus whitespaces in the words
* [Feature] Implement more strict configuration tests
* [Feature] Improve SPF results in Authentication-Results
* [Feature] Support ClickHouse database
* [Fix] Add failsafety for utf8 regexps
* [Fix] Do not trigger BROKEN_CONTENT_TYPE on innocent text parts
* [Fix] Emit error if connection has been terminated with no stop pattern
* [Fix] Fix boundaries checks in embedded messages
* [Fix] Fix double free
* [Fix] Perform policy downgrade on sample out, add tests
* [Fix] Properly escape utf8 regexps in hyperscan mode
* [Fix] Selectors - attachments args condition
* [Fix] Some fixes for raw parts
* [Fix] Treat learning errors as non-fatal
* [Fix] Use tld when looking for DKIM domains
* [Project] Words unicode structure rework
* [Project] Add preliminary Redis Sentinel support
* [Project] Improve Authentication-Results header
* [Project] Rework DKIM checks results
* [Project] Use more generalised API to produce meta words
-----BEGIN PGP SIGNATURE-----
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=YQg8
-----END PGP SIGNATURE-----