Prepare 2.1.0 release #299

Job	Run time
build (ubuntu-latest, Debug, True)	11m 45s
build (ubuntu-latest, Debug, False)	11m 57s
build (ubuntu-latest, Release, True)	10m 1s
build (ubuntu-latest, Release, False)	9m 30s
build (windows-latest, Debug, True)	20m 54s
build (windows-latest, Debug, False)	20m 16s
build (windows-latest, Release, True)	13m 54s
build (windows-latest, Release, False)	13m 30s
build (macos-latest, Debug, True)	3m 58s
build (macos-latest, Debug, False)	5m 8s
build (macos-latest, Release, True)	4m 9s
build (macos-latest, Release, False)	4m 11s
	2h 9m 13s

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