WIP: switching to pyproject.toml #477

Job	Run time
publish-on-pypi	1m 47s
build-installer-on-windows / build	2m 59s
build-on-macos / build	4m 8s
build-on-windows / build	4m 9s
build-on-ubuntu / build	3m 57s
publish-on-github	0s
	17m 0s

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