Add unified rfl::Settings::with<>() API for format-specific settings … #748

Job	Run time
windows-msvc-shared (MSGPACK)	4m 6s
windows-msvc-shared (CAPNPROTO)	8m 3s
windows-msvc-shared (JSON)	11m 40s
windows-msvc-shared (XML)	5m 38s
windows-msvc-shared (UBJSON)	7m 52s
windows-msvc-shared (PARQUET)	36m 27s
windows-msvc-shared (FLEXBUFFERS)	5m 40s
windows-msvc-shared (BOOST_SERIALIZATION)	7m 0s
windows-msvc-shared (AVRO)	6m 24s
windows-msvc-shared (YAML)	4m 38s
windows-msvc-shared (TOML)	4m 0s
windows-msvc-shared (CBOR)	9m 22s
windows-msvc (CBOR)	8m 6s
windows-msvc (XML)	3m 38s
windows-msvc (CAPNPROTO)	8m 31s
windows-msvc (YAML)	4m 4s
windows-msvc (FLEXBUFFERS)	6m 31s
windows-msvc (BOOST_SERIALIZATION)	6m 47s
windows-msvc (CEREAL)	3m 48s
windows-msvc (JSON)	12m 35s
windows-msvc (UBJSON)	8m 20s
windows-msvc (benchmarks)	49m 20s
windows-msvc (PARQUET)	35m 58s
windows-msvc (MSGPACK)	3m 47s
windows-msvc (TOML)	4m 34s
windows-msvc (AVRO)	7m 9s
	4h 33m 58s

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