* [Fix] Allow to init resolver without rspamd_config
* [Fix] Do not crash when resolver failed to initialize
* [Fix] Fix abstract context layout
* [Fix] Fix CGP helper reply parsing
* [Fix] Fix crashes when socket write errors occur
* [Fix] Fix parsing IPv6 nameservers in resolv.conf
* [Fix] Milter: Don't defer on "greylist" action

Signed-off-by: Vsevolod Stakhov <vsevolod@highsecure.ru>

Issue: #1682

* [Conf] Add rspamd_proxy to the default configuration set
* [Conf] Add sample arc module config
* [Conf] Do away with systemd specifics completely
* [Conf] Increase min_bytes to avoid FP
* [Conf] Remove ratelimits from default configuration
* [CritFix] Fix accepting on IPv6 sockets
* [CritFix] Fix corruption when multiple fuzzy are defined
* [CritFix] Fix learn condition in fuzzy check
* [CritFix] Fix memory leak in fuzzy check
* [CritFix] Fix memory leak in maps scheduling
* [CritFix] Paese the last character in DKIM signature correctly
* [CritFix] Zero fill sockaddr_un
* [Feature] Add ability to add doc strings by example
* [Feature] Add API to verify DKIM (and ARC) signatures
* [Feature] Add compression/decompression to proxy
* [Feature] Add count to url structure
* [Feature] Add initial support of the new protocol reply
* [Feature] Add Lua plugin spamtrap
* [Feature] Add `monitored_address` for rbls
* [Feature] Add new schema for bayes tokens
* [Feature] Add preliminary ARC support to dkim code
* [Feature] Add preliminary support of ARC signing
* [Feature] Add rules to detect bad 8bit characters in From and To
* [Feature] Add scanning support for milter protocol
* [Feature] Add support for bidirectional symbols in rspamd_stats
* [Feature] Add support for static maps
* [Feature] Add support of maps with multiple regexps matches
* [Feature] Add `text_multiplier` param
* [Feature] Add the preliminary ARC plugin
* [Feature] Add top redirector targets rank
* [Feature] Allow async events to be registered from LUA rules
* [Feature] Allow storing bayes tokens in Redis
* [Feature] Allow to exclude specific domains from mx check
* [Feature] Allow to have a stack of watcher finalisers
* [Feature] Allow to pass hostname to `-i` flag in Rspamc
* [Feature] Allow to set custom user agent in url redirector
* [Feature] Allow to use custom callback when parsing resolv.conf
* [Feature] Allow to use domain from authenticated user
* [Feature] Bayes expiry plugin
* [Feature] Check dkim sign keys for modifications
* [Feature] DKIM signing: sign_networks/local address specific use_domain settings
* [Feature] DMARC: Support excluding domains from sampling
* [Feature] Expire processing items for URL redirector aggressively
* [Feature] Fix surbl monitored for IP lists, add `monitored_domain` option
* [Feature] Implement caching for dkim body hashes
* [Feature] Implement milter protocol scan reply
* [Feature] Improve omograph phishing detection
* [Feature] Initial support of self-scan in Rspamd proxy
* [Feature] Keep track of headers in milter interface
* [Feature] Milter headers: better controls for local/authenticated
* [Feature] Multimap: email:domain:tld filter
* [Feature] Preliminary DMARC reporting implementation
* [Feature] Reuse stemmers in the cache
* [Feature] Rework confighelp to load Lua plugins
* [Feature] Rework hfilter to use hyperscan if possible
* [Feature] Rework lua RSA API
* [Feature] Rmilter_headers: approximate rmilter's extended_spam_headers
* [Feature] Start integration of milter support in proxy
* [Feature] Store average words length and short words count
* [Feature] Store hash of headers order and names
* [Feature] Support MTA name header
* [Feature] Support multiple types of dkim signing in Lua
* [Feature] Support numeric arguments for Redis requests
* [Feature] Use headers hash in bayes metatokens
* [Feature] Use normal resolv.conf rules of rotation in Rspamd
* [Feature] Use version 2 proto for checking messages
* [Fix] Allow to follow symlinks when safe
* [Fix] Append MX name for authentication results as required
* [Fix] Change default text multiplier from 0.5 to 2.0
* [Fix] Check min_bytes for images as well
* [Fix] Deal with 7bit charsets properly
* [Fix] Deal with 8bit characters in email addresses
* [Fix] Deal with unpaired <a> tags
* [Fix] Detect confighelp in plugins initialisation
* [Fix] Disable certain checks for utf spoof detection
* [Fix] DKIM Signing: avoid nil index when From header is missing
* [Fix] Do not add exact hashes from different parts
* [Fix] Do not check DMARC if SPF or DKIM were not checked
* [Fix] Do not check URLs that are resolved to be redirected
* [Fix] Do not set bayes probability if we don't use it
* [Fix] Do not stop on illegal unicode points - replace them
* [Fix] Fix another race condition in arc checks
* [Fix] Fix arc count logic
* [Fix] Fix ARC signing
* [Fix] Fix brain-damaged spamc protocol for now
* [Fix] Fix calling for peak functions
* [Fix] Fix couple of issues in FORWARDED rule
* [Fix] Fix CTE propagation from parent containers to children parts
* [Fix] Fix errors processing in the controller
* [Fix] Fix format string in milter
* [Fix] Fix issues in SPF macros parsing
* [Fix] Fix logging format string
* [Fix] Fix logic of cached passwords check
* [Fix] Fix lowercasing of stemmed words
* [Fix] Fix LRU elements removal
* [Fix] Fix memory leak when accepting from unix sockets
* [Fix] Fix milter connections persistence
* [Fix] Fix objects merging in UCL
* [Fix] Fix order of operations to avoid race condition
* [Fix] Fix parsing of long regexp types
* [Fix] Fix passing data to log helper when many symbols defined
* [Fix] Fix pools management for milter session
* [Fix] Fix processing of the watchers
* [Fix] Fix queue id macro in milter
* [Fix] Fix R_BAD_CTE_7BIT rule
* [Fix] Fix Redis timeout set
* [Fix] Fix REPLYTO_UNPARSEABLE rule
* [Fix] Fix setting of email address
* [Fix] Fix some more issues about duplicated fuzzy requests
* [Fix] Fix spamc support in rspamd proxy
* [Fix] Fix syntax error in spamtrap plugin
* [Fix] Fix url counts for href urls
* [Fix] Fix url handling in the protocol
* [Fix] Multimap: Received IP filters with Redis
* [Fix] Oops, fix d9d0fa5e86
* [Fix] Parse rgb[a](x,x,x[,x]) css colors
* [Fix] Phishing: strict_domains
* [Fix] Reduce maps aggressiveness
* [Fix] Reresolve upstreams even if there is a single server there
* [Fix] Rspamadm grep: Disable Lua patterns in string search by default
* [Fix] Skip text parts when checking binary parts in fuzzy check
* [Fix] Support v2 checks in controller
* [Fix] Treat empty address as valid
* [Fix] Try harder to detect CTE
* [Fix] Try to deal with v4 mapped to v6 addresses on accept
* [Fix] Use dkim signing callback properly
* [Fix] Use non-volatile memory for storing data
* [Fix] Use static maps instead of ugly hack for radix_from_config
* [Fix] Use the same pool for related sessions
* [Rework] Continue modularisation for lua library
* [Rework] Initial milter protocol support
* [Rework] Make log pipes worker agnostic, add scanners API
* [Rework] Move authentication results generation to a separate routine
* [Rework] Move common DKIM functions to a separate lua module
* [Rework] Move global functions to a separate directory
* [Rework] Prepare dkim module for ARC checks
* [Rework] Propagate ucl variables from the command line
* [Rework] Remove multiple metrics support from Rspamd
* [Rework] Stop using name 'rmilter' for the modern protocol
* [Rework] Use LFU algorithm in LRU cache
* [Rules] Fix received TLS rules
* [Rules] Improve URL_COUNT_ODD rule
* [WebUI] Fix add header filter in history
* [WebUI] Use modern protocol for checking messages

Signed-off-by: Vsevolod Stakhov <vsevolod@highsecure.ru>

Issue: #913

Issue: #1669

[Conf] Do away with systemd specifics completely

[Minor] SPOOF_REPLY_TO: mitigate some possible FPs on mailing list posts (#1673)

[Feature] Bayes expiry plugin

It is now possible to remove not first but also last or even all headers
with the specific name by using `milter` control block in Rspamd.