* Zone name validation checking for double dots, and throwing InvalidNameError
rather than base Exception
* Record validation checks for double dots in names
* MetaProcessor.include_extra to add support for arbitrary extra values to be
set on the meta record.
* Correctly handled quoted svcparams when parsing SVCB/HTTPS rdata text
* Fix handling of chunked values (TXT, SPF) when escaped characters land at the
split boundaries, don't split escapes from their following chars