wip: restructure the entire thing #120

Job	Run time
cross-compile-windows (x64-mingw32)	4m 5s
cross-compile-windows (x64-mingw-ucrt)	4m 6s
cross-compile-linux	9s
install-windows-native (2.7)	4m 2s
install-macos-m1 (2.7)	55s
install-windows-native (3.0)	1m 20s
install-macos-m1 (3.0)	17s
install-windows-native (3.1)	1m 16s
install-macos-m1 (3.1)	23s
install-windows-native (3.2)	1m 27s
install-macos-m1 (3.2)	17s
install-windows-native (3.3)	2m 34s
install-macos-m1 (3.3)	17s
install-windows-native (3.4)	1m 55s
install-macos-m1 (3.4)	19s
test-linux (2017, 2.7)	3m 1s
test-linux (2017, 3.0)	2m 48s
test-linux (2017, 3.1)	2m 30s
test-linux (2017, 3.2)	2m 50s
test-linux (2017, 3.3)	2m 35s
test-linux (2017, 3.4)	2m 42s
test-linux (2019, 2.7)	2m 50s
test-linux (2019, 3.0)	2m 48s
test-linux (2019, 3.1)	2m 53s
test-linux (2019, 3.2)	2m 38s
test-linux (2019, 3.3)	2m 38s
test-linux (2019, 3.4)	2m 42s
test-linux (2022, 2.7)	2m 48s
test-linux (2022, 3.0)	2m 39s
test-linux (2022, 3.1)	2m 39s
test-linux (2022, 3.2)	2m 38s
test-linux (2022, 3.3)	2m 32s
test-linux (2022, 3.4)	2m 40s
install-windows-ucrt	1s
test-windows-ucrt	1s
install-windows-mingw	1s
test-windows-mingw	1s
	1h 12m 17s

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