WIP: switching to pyproject.toml #492

Job	Run time
publish-on-pypi	38s
build-on-macos / build	18m 1s
build-on-ubuntu / build	33s
build-installer-on-windows / build	5m 18s
build-on-windows / build	5m 13s
publish-on-github	0s
	29m 43s

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