Escape all the things \o/

[Minor] WHITE_ON_WHITE: Use per-part transparency length

[Fix] WHITE_ON_WHITE: Ensure score is matched to part that fired the …

Fix lua_util_is_utf_spoofed logic

When compiled against libicu < 51 the list of allowed characters was
set to none, so all strings were flagged as spoofed.

Fixes #1689.

Escape HTML in cells by using underscores escaper, fixes #1738

* [Conf] Remove Rambler email bl for now
* [Conf] Switch RAMBLER_URIBL to a locally managed source
* [CritFix] Switch from ragel to C for Content-Type parsing
* [Feature] Add `-e` option for lua_repl
* [Feature] Add per-domain emails normalisation rules
* [Feature] Add sessions cache to debug dangling sessions
* [Feature] Add short_text_direct_hash for fuzzy check module
* [Feature] Add text_part:get_stats function
* [Feature] Allow to add custom processing script for surbl
* [Feature] Allow to check reply-to email
* [Feature] Allow to customize spam header, remove existing spam headers
* [Feature] Allow to disable specific workers in the config
* [Feature] Allow to discard messages instead of rejection
* [Feature] Allow to specify custom delimiter in emails plugin
* [Feature] Allow to specify custom User-Agent for rspamc
* [Feature] Allow to store symbols data in Clickhouse
* [Feature] Allow to use HTTPS when connecting to Clickhouse
* [Feature] Enable sessions cache tracking for milter connections
* [Feature] Implement per-line mode in lua_repl (like `perl -p`)
* [Feature] Implement rdns-curve plugin based on rspamd cryptobox
* [Feature] Improve maps cached data lifetime
* [Feature] Improve maps checking frequency
* [Feature] Improve monitored timeouts logic
* [Feature] milter_headers: add `extended_headers_rcpt` option
* [Feature] Milter headers: Add X-Spam-Flag to rmilter-compatibility headers
* [Feature] Milter headers: remove-header routine
* [Feature] Multimap: received filters for extracting TLDs from hostnames
* [Feature] Normalize email aliases in emails module
* [Feature] Re-add rambler email bl (as hashed list)
* [Feature] Reload file maps more frequently
* [Feature] Rework newlines strip parser one more time
* [Feature] Skip updates for messages scanned via controller
* [Feature] Split long DKIM public keys
* [Feature] Store more data when stripping newlines
* [Feature] Support SPF macros transformations
* [Feature] Support suppressing DMARC reports for some domains
* [Fix] Add missing `break` statement
* [Fix] Allow modifiers in SPF macros
* [Fix] DKIM sign tools: edge-cases around use_esld
* [Fix] Do not cache SPF records with macros
* [Fix] Do not overwrite score when setting pre-action
* [Fix] Fix comparision logic
* [Fix] Fix DKIM base64 folding for milter flagged messages
* [Fix] Fix emails module configuration
* [Fix] Fix folding for arc headers when milter interface is used
* [Fix] Fix gmail dots removal
* [Fix] Fix rspamc detection in greylist module
* [Fix] Fix some more issues with HTTP maps
* [Fix] Milter sessions can live forever
* [Fix] Normalize fuzzy probability better
* [Fix] Plug memory leak
* [Fix] RBL: Fixed hashed email address lookups
* [Fix] Try to deal with brain-damaged milter behaviour
* [Fix] Use `\n` to fold headers for milter
* [Rework] Allow to use custom callback for monitored checks
* [Rework] Further steps towards one process monitoring
* [Rework] Send health checks from a single worker
* [WebUI] Round-up throughput summary values

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

[Minor] Update redirectors list

[Feature] Reload file maps more frequently