Add rfl::Deprecated, which adds deprecated and deprecationMessage to the generated schema field. #565

Job	Run time
windows-msvc-shared (FLEXBUFFERS)	6m 45s
windows-msvc-shared (AVRO)	7m 50s
windows-msvc-shared (UBJSON)	7m 8s
windows-msvc-shared (MSGPACK)	3m 57s
windows-msvc-shared (CBOR)	9m 53s
windows-msvc-shared (XML)	4m 4s
windows-msvc-shared (YAML)	4m 18s
windows-msvc-shared (TOML)	4m 54s
windows-msvc-shared (CAPNPROTO)	7m 59s
windows-msvc-shared (JSON)	12m 24s
windows-msvc-shared (PARQUET)	38m 54s
windows-msvc (CAPNPROTO)	8m 31s
windows-msvc (AVRO)	7m 23s
windows-msvc (PARQUET)	39m 10s
windows-msvc (CBOR)	9m 6s
windows-msvc (benchmarks)	47m 33s
windows-msvc (JSON)	12m 50s
windows-msvc (XML)	4m 2s
windows-msvc (FLEXBUFFERS)	6m 10s
windows-msvc (MSGPACK)	4m 35s
windows-msvc (YAML)	4m 25s
windows-msvc (UBJSON)	7m 13s
windows-msvc (TOML)	4m 6s
	4h 23m 10s

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