WIP: switching to pyproject.toml #487

Job	Run time
publish-on-pypi	1m 14s
build-on-windows / build	5m 28s
build-installer-on-windows / build	5m 40s
build-on-macos / build	4m 6s
build-on-ubuntu / build	1m 1s
publish-on-github	0s
	17m 29s

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