Removed unnecessary std::move, fixes #533 #336

Job	Run time
windows-msvc-shared (JSON)	10m 45s
windows-msvc-shared (UBJSON)	6m 48s
windows-msvc-shared (CAPNPROTO)	8m 30s
windows-msvc-shared (TOML)	4m 2s
windows-msvc-shared (AVRO)	7m 11s
windows-msvc-shared (PARQUET)	39m 12s
windows-msvc-shared (XML)	4m 15s
windows-msvc-shared (YAML)	4m 37s
windows-msvc-shared (FLEXBUFFERS)	5m 50s
windows-msvc-shared (CBOR)	9m 26s
windows-msvc-shared (MSGPACK)	4m 11s
windows-msvc (benchmarks)	49m 24s
windows-msvc (AVRO)	7m 10s
windows-msvc (CBOR)	8m 38s
windows-msvc (CAPNPROTO)	7m 49s
windows-msvc (MSGPACK)	3m 53s
windows-msvc (PARQUET)	38m 15s
windows-msvc (XML)	3m 57s
windows-msvc (JSON)	10m 15s
windows-msvc (TOML)	4m 54s
windows-msvc (FLEXBUFFERS)	6m 14s
windows-msvc (YAML)	4m 1s
windows-msvc (UBJSON)	7m 12s
	4h 16m 29s

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