[Feature] Support JSON logging when in syslog mode

[Minor] Add more returnbits to surbl configuration

[Minor] rspamd_task API docs: fix broken link

[Fix] Resolve issue with bayes stat in `rspamadm` mode

[Minor] configwizard: really use LOCAL_CONFDIR

Deal with `Connection` and `Host` headers on proxying

[Feature] Allow to add templates to redis history prefix

Issue: #4793
Closes: #4793

[WebUI] Show pass-through module in History

[Minor] Move server selection logic to common.js

[Rework] Breaking: Do not report module as action

in the /history response since we have the `passthrough_module` key
for that purpose.

While that might be handy in some situations,
mixing actions and module names is confusing in general.

[Feature] Add extraction type for `from` maps

Attribute name: `extract_from`. Possible values:

* `default` - try smtp, if not exists try mime
* `mime` - check mime only
* `smtp` - check smtp only
* `both` - try to match both

* [Fix] Fix headers insertion in the ordered list
* [Fix] Fix learn error propagation
* [Fix] Fix learning with long prefixes
* [Fix] Fix potential double free by expclicitly zeroing pointers
* [Fix] Fix storing of the bayes tokens
* [Fix] Use short comments rather than long one

[Minor] rbl: fix warning

[Test] statistics: per-user

Issue: #4786
Closes: #4786

[Fix] Replace comment types

Rspamd fails to start with Lua-5.1 because long comment does not allow
nesting, see [1]. This change replaces it to short comments in order to
fix the issue but preserves this part as comment in docs.

[1] https://www.lua.org/manual/5.1/manual.html#7.1

Bug: https://bugs.gentoo.org/922522
Fixes: b189c9fea6 ("[Minor] lua_maps docs: apply formatting")
Fixes: https://github.com/rspamd/rspamd/issues/4784

* [Project] Rspamadm fuzzyping command
* [Project] Use Redis scripts for Bayes statistics and cache
* [Project] Support  JSON logging
* [CritFix] - Fix reported length of logging structure
* [Feature] Allow to set `max_users` for Redis bayes backend
* [Feature] Escape JSON when needed
* [Feature] Proxy: Allow `encrypted_only` option
* [Feature] Reiterate on gtube patterns
* [Feature] Support ping command in fuzzy storage
* [Feature] Support suppressing DMARC reporting for particular recipients
* [Feature] rbl: support disabling or replacing url_whitelist per RBL
* [Fix] Another try to fix setproctitle
* [Fix] Cleanup session on exit
* [Fix] Do not cleanup hyperscan files unless new ones are loaded
* [Fix] Fix bad access when printing pending events on failure path
* [Fix] Fix issues with the raw header on header insertion/modification
* [Fix] Fix overflow in fuzzy_stats command
* [Fix] Fix some corner cases when parsing maps with no newlines
* [Fix] Fix various issues with canonicalisation of the paths
* [Fix] Fix wrong raw_len usage
* [Fix] Make words selection random deterministic upon content
* [Fix] Properly set config field when creating tasks from Lua
* [Fix] Really fix the language detector statistical heuristic
* [Fix] Set loaded variable explicitly
* [Fix] dkim_signing: siging_table: lowercase before lookup
* [Fix] known_senders: fix config handling
* [Fix] rbl: fix `exclude_local`

[Fix] multimap: rawtext: use decoded parts