wip: restructure the entire thing #129

Job	Run time
cross-compile-linux	8s
cross-compile-windows (x64-mingw32)	7m 10s
install-windows-native (2.7)	4m 2s
cross-compile-windows (x64-mingw-ucrt)	7m 12s
install-windows-native (3.0)	1m 18s
install-macos-m1 (2.7)	52s
install-windows-native (3.1)	1m 19s
install-macos-m1 (3.0)	18s
install-windows-native (3.2)	1m 39s
install-macos-m1 (3.1)	18s
install-windows-native (3.3)	2m 33s
install-macos-m1 (3.2)	18s
install-windows-native (3.4)	1m 44s
install-macos-m1 (3.3)	19s
install-macos-m1 (3.4)	21s
test-linux (2017, 2.7)	1m 22s
test-linux (2017, 3.0)	1m 11s
test-linux (2017, 3.1)	1m 15s
test-linux (2017, 3.2)	1m 20s
test-linux (2017, 3.3)	1m 9s
test-linux (2017, 3.4)	1m 16s
test-linux (2019, 2.7)	1m 25s
test-linux (2019, 3.0)	1m 9s
test-linux (2019, 3.1)	1m 20s
test-linux (2019, 3.2)	1m 23s
test-linux (2019, 3.3)	1m 23s
test-linux (2019, 3.4)	1m 12s
test-linux (2022, 2.7)	1m 26s
test-linux (2022, 3.0)	1m 18s
test-linux (2022, 3.1)	1m 14s
test-linux (2022, 3.2)	1m 17s
test-linux (2022, 3.3)	1m 18s
test-linux (2022, 3.4)	1m 53s
install-windows-ucrt	0s
install-windows-mingw	0s
test-windows-mingw	0s
test-windows-ucrt	0s
	53m 22s

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