wip: restructure the entire thing #124

Job	Run time
cross-compile-linux	7s
install-macos-m1 (2.7)	48s
cross-compile-windows (x64-mingw32)	46s
install-macos-m1 (3.0)	20s
install-windows-native (2.7)	1m 59s
cross-compile-windows (x64-mingw-ucrt)	46s
install-macos-m1 (3.1)	18s
install-windows-native (3.0)	1m 59s
install-macos-m1 (3.2)	19s
install-windows-native (3.1)	1m 43s
install-windows-native (3.2)	1m 56s
install-windows-native (3.3)	1m 58s
install-windows-native (3.4)	1m 57s
install-macos-m1 (3.3)	21s
install-macos-m1 (3.4)	17s
test-linux (2017, 2.7)	24s
test-linux (2017, 3.0)	8s
test-linux (2017, 3.1)	16s
test-linux (2017, 3.2)	10s
test-linux (2017, 3.3)	9s
test-linux (2017, 3.4)	8s
test-linux (2019, 2.7)	29s
test-linux (2019, 3.0)	15s
test-linux (2019, 3.1)	8s
test-linux (2019, 3.2)	12s
test-linux (2019, 3.3)	10s
test-linux (2019, 3.4)	10s
test-linux (2022, 2.7)	22s
test-linux (2022, 3.0)	10s
test-linux (2022, 3.1)	16s
test-linux (2022, 3.2)	15s
test-linux (2022, 3.3)	8s
test-linux (2022, 3.4)	15s
test-windows-mingw	0s
install-windows-mingw	0s
install-windows-ucrt	0s
test-windows-ucrt	0s
	19m 39s

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