WIP: switching to pyproject.toml #481

Job	Run time
publish-on-pypi	1m 13s
build-installer-on-windows / build	3m 3s
build-on-macos / build	4m 7s
build-on-windows / build	2m 52s
build-on-ubuntu / build	1m 0s
publish-on-github	0s
	12m 15s

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