Release 1.8.0

* [Feature] Add arguments schemas to processors and extractors
* [Feature] Add functional selectors library
* [Feature] Add generic selector to reputation module
* [Feature] Add more ratelimits: by digest, by attachments data, by filenames
* [Feature] Add preliminary stop words detection support
* [Feature] Add pure Lua debugm function
* [Feature] Add schema validation for Redis settings
* [Feature] Add selectors combine function
* [Feature] Add some recursion protection to lua logger
* [Feature] Add support for Lua API tracing
* [Feature] Allow to apply schema to arguments
* [Feature] Allow to get dkim signing data directly from HTTP headers
* [Feature] Allow to reuse existing authentication results
* [Feature] Cache selectors results in re runtime
* [Feature] Implement new text tokenizer based on libicu
* [Feature] Integrate selectors framework to multimap
* [Feature] Relax FORGED_RECIPIENTS
* [Feature] Support (almost) all html entities
* [Feature] Support adding and deletion of recipients in the milter block
* [Feature] Support gathering HTTP body from fragments in lua_http
* [Feature] Support multi flag in regexp and glob maps
* [Feature] Support selectors in ratelimit module
* [Feature] Support selectors in settings
* [Feature] Use khash in HTML parser
* [Feature] Use pure Lua debugm function
* [Fix] Add fail-safety for destroying sessions
* [Fix] Allow to add result-less fake DNS records
* [Fix] Another try to fix race conditions on config unload
* [Fix] Call Lua callback on DNS timeouts
* [Fix] Deprecate task:inc_dns_req as it is redundant
* [Fix] Do not allow events deletions on cleanup
* [Fix] Do not try to process skipped messages
* [Fix] Fix HTTP requests with no body
* [Fix] Fix another cleanup race condition
* [Fix] Fix bug in processing of pcre regexps
* [Fix] Fix byte array allocation in the pool
* [Fix] Fix crashes on task cleanup
* [Fix] Fix dynamic buckets in ratelimits
* [Fix] Fix endless loop when waiting for Rspamd to stop
* [Fix] Fix lua_util.str_split in case of delimiters set
* [Fix] Fix more issues with watching of async events
* [Fix] Fix stop words detection and loading logic
* [Fix] Fix various corner cases for language detection
* [Fix] Fix watchers in lua_tcp
* [Fix] Fix words decay algorithm
* [Fix] Implement watchers replacement to handle nested calls
* [Fix] Save faked code into fake dns record
* [Fix] Show the proper frame when using lua_util.debugm
* [Fix] Use fake dns records in tests
* [Fix] Use unicode replacements for HTML entities
* [Fix] fixed "cannot find dependency on symbol 1" issue when using replaced symbols in spamassassin rules
* [Fix] partition_id is not available in old versions of CH
* [Project] Add implicit conversion logic to selectors
* [Project] Add initial support for selectors in regexps
* [Project] Add method concept
* [Project] Further changes in unicode operations
* [Project] Implement Clickhouse migrations
* [Project] Implement implicit conversions to userdata
* [Project] Implement insert method
* [Project] Implement selectors registration for regular expressions
* [Project] Implement selectors support in re_cache
* [Project] Improve language detector: cleanup unused files, categorize
* [Project] Migrate CH data to a fat table
* [Project] Rework selectors logic
* [Project] Start Clickhouse utilities library
* [Project] Start unicode rework
* [Project] coroutine threaded model for API calls: thread pool
* [Rework] Move phishtank to a DNS based service
* [Rework] Rework Clickhouse plugin to use the new API
* [Rework] Rework language detector
* [Rework] Rework utf content processing in text parts
* [WebUI] Add progress bar for AJAX requests
* [WebUI] Avoid errors table reinitialization
* [WebUI] Avoid history table reinitialization
* [WebUI] Avoid throughput summary table reinitialization
* [WebUI] Destroy summary table on disconnect
* [WebUI] Fix "auth" request URL
* [WebUI] Fix disabling and hiding controls on page reload
* [WebUI] Fix maps loading from neighbours
* [WebUI] Fix symbols sorting by score
* [WebUI] Fix tables destroying
* [WebUI] Fix throughput data consolidation
* [WebUI] Fix upload buttons disabling
* [WebUI] Notify user on module loading failure
* [WebUI] Update FooTable 3.1.4 -> 3.1.6
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