Allow support for atomic variables; resolves #575 (#577) #450

Job	Run time
windows-msvc-shared (TOML)	4m 10s
windows-msvc-shared (XML)	3m 52s
windows-msvc-shared (CBOR)	8m 36s
windows-msvc-shared (CAPNPROTO)	7m 58s
windows-msvc-shared (UBJSON)	7m 8s
windows-msvc-shared (YAML)	4m 52s
windows-msvc-shared (PARQUET)	39m 39s
windows-msvc-shared (FLEXBUFFERS)	5m 29s
windows-msvc-shared (AVRO)	7m 7s
windows-msvc-shared (MSGPACK)	3m 54s
windows-msvc (CBOR)	6m 15s
windows-msvc (benchmarks)	6m 51s
windows-msvc (TOML)	3m 53s
windows-msvc (XML)	3m 48s
windows-msvc-shared (JSON)	11m 21s
windows-msvc (PARQUET)	6m 35s
windows-msvc (FLEXBUFFERS)	5m 24s
windows-msvc (AVRO)	5m 46s
windows-msvc (UBJSON)	4m 53s
windows-msvc (MSGPACK)	4m 10s
windows-msvc (CAPNPROTO)	4m 48s
windows-msvc (JSON)	4m 45s
windows-msvc (YAML)	4m 20s
	2h 45m 34s

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