Update rspamd to 0.9.5

0.9.5:
* Avoid double free when extending HTTP message.
* Fix double free if multiple classifiers are defined.
* Fix misprint in spamassassin plugin.
* Fix cpuid invocation on i386.
* Fix ownership issues for zero-copy decode.
* Allow __len metamethod on rspamd{text}.
* Add base64 decoding lua utility.
* Fix build on FreeBSD
* Skip spaces at the beginning of mime messages.
* DBL_ABUSE_REDIR should not have significant weight.
* Allow to split by lua_regexp rspamd{text} objects.
* Allow to specify custom stop pattern for lua_tcp.

0.9.4:
* Fix critical bugs in tokenization algorithm
* Write unit tests for tokenization
* Add documentation for lua_tcp
* Switch off legacy tokenization by default.
* Fix critical bugs in words normalization
* Add lua bindings to tokenizer.
* Implement storing of HTTP headers inside task
* Add lua API to accerss HTTP headers data
* Implemented base64 encoding suitable for MIME
* Use caseless hash and equal functions for HTTP request headers.
* Improve debian architectures support (by @dottedmag)

0.9.3:
* Revert incorrect regexp change that broke the default rules
* Fix lua_tcp module

0.9.2:
* Fix error on spawning unique workers.
* Add preliminary version of generic LUA TCP requests API.
* Use lua 5.1 if luajit is not available (Arm64, PowerPC, s390x etc)
* Fix fuzzy mime strings with only type.
* Improve thunderbird sanity checks.
* Fix critical bug on matching regular expressions.
* Make hiredis optional dependency.
* Fix multiple bugs in daemon reloading

0.9.1:
* Restore utf8 validation for regular expressions to avoid crashes
* Fix symbols displaying in the interface
* Add symbol groups to the interface
* Fix maps ID parsing in the controller
* Add multimap and regexp modules documentation
* Backport fixes from libucl
* Fix debian package (by @dottedmag)
* Rework XXH32 invocations

0.9.0:
* Add support of the fast and secure protocol level encryption:
- curve25519 is used for key exchange;
- chacha20/poly1305 cryptobox construction for bulk encryption;
- zero latency overhead;
- encrypting and balancing HTTP proxy worker
* Rework expressions and create new expressions library:
- aggressive optimizations based on the abstract syntax tree;
- abstract expressions support (regular expressions, functions, lua modules
  composites and so on)
- New comparision and '+' operators support
- New greedy algorithm to minimize execution time of expressions and
  all symbols
- Dynamic expressions benchmark and reoptimizations
* Many improvements to the LUA API:
- reworked logger module allowing to do pretty print of the most of lua
  types (including tables and userdata classes)
- reworked lua redis and lua HTTP to support more features
- added opaque type for passing large text chunks without copying
- new regexp module with many auxiliary functions (e.g. `re:split`)
* LuaJIT is now the default requirement for rspamd allowing to speed up lua
  execution by a large margin (however, plain lua is still supported)
* New plugins:
- spamassassin rules plugin that allows to load and re-use the most of
  SA rules natively
- DMARC plugin that evaluates SPF and DKIM policies to the domain policies
- many old plugins has been reworked to implement new features and improve
  stability
* New aho-corasic trie implementation from @mischasan that allows to load and
  use hundreds of thousands of patterns with no influence on load
* Support of PCRE JIT and PCRE JIT fast path modes that significantly improves
  the performance of regular expressions if supported by PCRE
* New URLs parser and extractor:
- removed legacy code that was useless for url finding
- reworked algorithms of URL parsing for more precise and accurate results
- added top-level-domains tree from http://publicsuffix.org
- improved emails parsing
- removed many phishing false positives due to TLD tree check
* New statistics infrastructure:
- created a separate layer of statistic library
- improved OSB-Bayes by re-weighting tokens according to the original
  academic paper and `crm114` implementation, which reduced false positives
  rate significantly
- created learn cache to avoid double learning of statistics and providing
  an efficient way to re-learn class for a message
- created abstract layers for different statistics backends
- implemented new tokenization algorithms with fast or secure (siphash)
  hashes to generate statistics features
* Reworked utf8 tokenization that previously corrupted all UTF8 words (minor
  incompatibility with old fuzzy hashes with utf-8 symbols)
* SPF module has been completely rewritten to support complex cases of
  `include` and `redirect` within SPF records
* DKIM module now supports multiple signatures
* Controller passwords can now be stored encrypted by `PBKDF2-HMAC` in the
  configuration file
* Many hand-written HTTP clients has been replaced with the common rspamd
  http module
* New test framework:
- import lua `telescope` test framework
- add unit tests for many rspamd modules and routines
- create a unit test for each possible bug found
- use luajit ffi for testing C code
- added preliminary support of functional testing by creating tasks from lua
* Randomize hash seed to avoid certain hash tables vulnerabilities
* Documentation improvements:
- added documentation for the vast majority of rspamd modules
- added documentation for rspamd protocol
- added documentation for the most of rspamd LUA extensions
* Fixed tonns of bugs and memory leaks
* Added tonns of minor features

0.8.3:
* Various critical fixes in distribution (by @dottedmag and @fatalbanana)
* Fixed bugs in url detector to parse certain patterns
* Add default host and helo for a client
* Some sanity checks for tokenizer and classifier
* Reiterate on systemd support
* Fix missing symbol registration
* Add support of spamc compatible output
* Filter double-dots in rbl.lua validate_dns (by @fatalbanana)
* Update ucl submodule due to critical bugfix

0.8.2:
* Create fuzzy db if it does not exist
* Fix: Centos init script: configtest() (by @AlexeySa)
* Enable one_shot for RECEIVED_SPAMHAUS_XBL - Fixes #102 (by @fatalbanana)
* Update Exim patch (by @fatalbanana)
* Fix processing of unix sockets.
* Allow applying settings to authenticated users (by @fatalbanana)
* Make settings priorities work as documented (by @fatalbanana)
* Fix race condition in symbols planner
* Add DNSWL_BLOCKED symbol (by @fatalbanana)
* Make Exim pass usernames to rspamd (by @fatalbanana)
* Update RBL module (by @fatalbanana):
- fix indentation;
- collapse loops;
- avoid calling for un-needed information;
- allow disabling RBLs for authenticated users
* once_received.lua: Fix indentation & add exclusion for authenticated users (by @fatalbanana)
* hfilter.lua: Add exclusion for authenticated users (by @AlexeySa)
* Updates to hfilter rules (by @AlexeySa)
* Set empty <> user or addr for msgs without FROM (by @eneq123)
* Fix: attempt to index field '?' (a nil value) (by @eneq123)
* Fix: if not exist Date-header (by @AlexeySa)
* Add task:get_content() method.
* rbl.lua: Ignore private IP space (by @fatalbanana)
* Allow to check radix maps from lua by rspamd{ip}
* Make local exclusions configurable per-RBL (by @fatalbanana)
* Add rspamd_config:radix_from_config() (by @fatalbanana)
* Support emails dnsbl in rbl (by @fatalbanana)
* Complete rework of url extraction logic
* Allow customizations for unix sockets. (fixes #182)
* Set lua path according to rspamd settings.
* Import lua-functional for plugins stuff.
* Completely rewrite multimap plugin in functional style.
* Fix FORGED_MUA_THUNDERBIRD_MSGID (fixes #186)
* Check IPv6 addresses at dnswl.org and Spamhaus whitelist (by @fatalbanana)
* Add lowercase utility for utf8 strings.
* Various fixes to build system
* Updated debian configuration infrastructure (by @dottedmag)

(wiedi)