Release 3.7.1

Release 3.7.1

* [CritFix] Fix leak in `gzip` function
* [Feature] Add ICAP Content-Type and Filename
* [Feature] Add `logging`->`task_max_elts` option
* [Feature] Add utility to split string like stuff for C++ code
* [Feature] Allow to set HTTP auth parameters for the maps
* [Feature] Check for plugin configuration errors on `configtest`
* [Feature] `known_senders` plugin
* [Feature] Use backward-cpp instead of manual libunwind stuff
* [Feature] rbl: support checking numeric URLs in isolation
* [Fix] CMakeLists.txt remove whitespace added by linter as it makes tests fail
* [Fix] Change Date: header location to conform with RFC
* [Fix] Correct format pattern for RE tree tempfile name
* [Fix] Correct format string for unw_word_t
* [Fix] Do not accept invalid ucl object types
* [Fix] Do not pollute public headers with libev internals
* [Fix] Do not set output type if list application failed
* [Fix] Fix `url:set_redirected` method
* [Fix] Fix format string and some length issues
* [Fix] Fix grammar definition for content-disposition attributes
* [Fix] Fix lua schema enrichment logic for Redis params
* [Fix] Fix lua stack corruption when logging large tables
* [Fix] Fix merge table utility
* [Fix] Fix output of non-RSA DKIM keys
* [Fix] Fix some corner cases of single-host urls parsing
* [Fix] Fix various issues in the `url_redirector` plugin
* [Fix] MISSING_MIMEOLE: avoid matching messages from Android GMail app (#4561)
* [Fix] Prevent DNSWL sabotage
* [Fix] Try to fix unzip function
* [Fix] rbl: really fix dependency registration when symbols_prefixes is used
* [Fix] rspamadm mime: arguments beginning with letter `t`
* [Rework] Breaking: return back to semver
* [Rework] Move rcl logic to C++