convert more of the codebase into rust! #66

Job	Run time
macos-universal	2m 46s
linux (x86_64-unknown-linux-gnu)	1m 10s
macos-x86_64	48s
linux (i686-unknown-linux-gnu)	1m 29s
linux-cross (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	1m 37s
linux-cross (armv7-unknown-linux-gnueabihf, armv7)	1m 43s
linux-cross (s390x-unknown-linux-gnu, s390x)	1m 32s
musllinux (x86_64-unknown-linux-musl)	58s
linux-cross (powerpc64le-unknown-linux-gnu, ppc64le)	1m 27s
musllinux (i686-unknown-linux-musl)	1m 0s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	58s
windows (x86_64-pc-windows-msvc)	2m 52s
linux-cross (powerpc64-unknown-linux-gnu, ppc64)	1m 45s
windows (i686-pc-windows-msvc)	2m 20s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	58s
windows (aarch64-pc-windows-msvc)	3m 3s
Release	0s
	26m 26s

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