Release 1.9.2

* [Conf] Allow to load users plugins from plugins.d
* [Conf] oversign openpgp and autocrypt headers
* [Feature] Add SPF FFI library for Lua
* [Feature] Add more verbosity for SPF caching
* [Feature] Antivirus: Handle encrypted files specially
* [Feature] Clickhouse: Slashing - add new fields to CH
* [Feature] Dkim_signing: Add OpenDKIM like signing_table and key_table
* [Feature] Dkim_signing: Allow to use new options as maps
* [Feature] Import fpconv library
* [Feature] Lua_maps: Allow static regexp and glob maps
* [Feature] Parse ical files
* [Feature] Rspamadm: Add dns_tool utility
* [Feature] Store SPF records digests
* [Feature] Use fpconv girsu2 implementation for printing floats
* [Fix] Clickhouse: Use integer seconds when inserting rows
* [Fix] Fix floating point printing
* [Fix] Fix processing of embedded urls
* [Fix] Lua_clickhouse: Fix CH errors processing
* [Fix] Make spf digest stable
* [Fix] Properly detect encrypted files in zip archives
* [Fix] Slashing: Store times in GMT timezone in ClickHouse
* [Rules] Add additional conditions to perform BTC checks
* [Rules] Fix pay-to-hash addresses validation
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