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Make sure that the headers are self-contained; fixes #528 #291

Job	Run time
windows-msvc-shared (AVRO)	6m 34s
windows-msvc-shared (JSON)	10m 50s
windows-msvc-shared (CAPNPROTO)	8m 29s
windows-msvc-shared (TOML)	3m 55s
windows-msvc-shared (PARQUET)	46m 59s
windows-msvc-shared (FLEXBUFFERS)	5m 41s
windows-msvc-shared (MSGPACK)	4m 27s
windows-msvc-shared (XML)	4m 39s
windows-msvc-shared (YAML)	4m 22s
windows-msvc-shared (CBOR)	8m 35s
windows-msvc-shared (UBJSON)	7m 32s
windows-msvc (JSON)	10m 29s
windows-msvc (AVRO)	7m 29s
windows-msvc (CAPNPROTO)	7m 50s
windows-msvc (CBOR)	8m 42s
windows-msvc (FLEXBUFFERS)	5m 31s
windows-msvc (UBJSON)	7m 18s
windows-msvc (benchmarks)	47m 10s
windows-msvc (PARQUET)	38m 25s
windows-msvc (TOML)	3m 55s
windows-msvc (YAML)	4m 14s
windows-msvc (XML)	3m 54s
windows-msvc (MSGPACK)	4m 12s
	4h 21m 12s