wip: restructure the entire thing #121

Job	Run time
cross-compile-windows (x64-mingw32)	2m 17s
cross-compile-windows (x64-mingw-ucrt)	2m 18s
cross-compile-linux	12s
install-windows-native (2.7)	2m 13s
install-macos-m1 (2.7)	1m 1s
install-windows-native (3.0)	1m 9s
install-macos-m1 (3.0)	16s
install-macos-m1 (3.1)	15s
install-windows-native (3.1)	57s
install-windows-native (3.2)	1m 31s
install-macos-m1 (3.2)	15s
install-windows-native (3.3)	2m 13s
install-macos-m1 (3.3)	17s
install-windows-native (3.4)	2m 14s
install-macos-m1 (3.4)	16s
test-linux (2017, 2.7)	2m 11s
test-linux (2017, 3.0)	2m 12s
test-linux (2017, 3.1)	2m 10s
test-linux (2017, 3.2)	2m 10s
test-linux (2017, 3.3)	2m 10s
test-linux (2017, 3.4)	2m 16s
test-linux (2019, 2.7)	2m 10s
test-linux (2019, 3.0)	2m 9s
test-linux (2019, 3.1)	2m 11s
test-linux (2019, 3.2)	2m 16s
test-linux (2019, 3.3)	2m 11s
test-linux (2019, 3.4)	2m 11s
test-linux (2022, 2.7)	2m 9s
test-linux (2022, 3.0)	2m 9s
test-linux (2022, 3.1)	2m 9s
test-linux (2022, 3.2)	2m 8s
test-linux (2022, 3.3)	2m 10s
test-linux (2022, 3.4)	2m 10s
test-windows-mingw	1s
install-windows-mingw	1s
install-windows-ucrt	1s
test-windows-ucrt	1s
	56m 40s

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