Update to 1.7.0 and rework metaprogramming #26

Job	Run time
sdist	10s
windows (windows-latest, x86)	2m 12s
windows (windows-latest, x64)	3m 2s
macos (macos-latest, aarch64)	45s
musllinux (ubuntu-latest, armv7)	1m 27s
musllinux (ubuntu-latest, x86)	1m 17s
linux (ubuntu-latest, aarch64)	1m 35s
linux (ubuntu-latest, x86)	1m 41s
linux (ubuntu-latest, ppc64le)	1m 52s
linux (ubuntu-latest, armv7)	1m 48s
musllinux (ubuntu-latest, aarch64)	1m 35s
linux (ubuntu-latest, x86_64)	1m 15s
macos (macos-latest, x86_64)	43s
linux (ubuntu-latest, s390x)	1m 37s
musllinux (ubuntu-latest, x86_64)	1m 18s
Release	0s
	22m 17s

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