wip: restructure the entire thing #128

Job	Run time
install-macos-m1 (2.7)	1m 12s
cross-compile-linux	9s
install-macos-m1 (3.0)	33s
cross-compile-windows (x64-mingw32)	55s
install-macos-m1 (3.1)	28s
install-windows-native (2.7)	2m 30s
cross-compile-windows (x64-mingw-ucrt)	54s
install-macos-m1 (3.2)	38s
install-windows-native (3.0)	1m 36s
install-macos-m1 (3.3)	29s
install-windows-native (3.1)	1m 41s
install-macos-m1 (3.4)	33s
install-windows-native (3.2)	1m 46s
install-windows-native (3.3)	2m 30s
install-windows-native (3.4)	2m 30s
test-linux (2017, 2.7)	1m 28s
test-linux (2017, 3.0)	1m 29s
test-linux (2017, 3.1)	1m 7s
test-linux (2017, 3.2)	1m 8s
test-linux (2017, 3.3)	1m 7s
test-linux (2017, 3.4)	1m 9s
test-linux (2019, 2.7)	1m 42s
test-linux (2019, 3.0)	1m 19s
test-linux (2019, 3.1)	1m 16s
test-linux (2019, 3.2)	1m 16s
test-linux (2019, 3.3)	1m 17s
test-linux (2019, 3.4)	1m 16s
test-linux (2022, 2.7)	1m 26s
test-linux (2022, 3.0)	1m 28s
test-linux (2022, 3.1)	1m 24s
test-linux (2022, 3.2)	1m 10s
test-linux (2022, 3.3)	1m 18s
test-linux (2022, 3.4)	1m 23s
test-windows-mingw	0s
install-windows-ucrt	0s
test-windows-ucrt	0s
install-windows-mingw	0s
	42m 7s

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