Simplify process interface #841

Job	Run time
build-windows-pr (dev, x86_64-pc-windows-msvc)	22m 54s
build-windows-pr (dev, x86_64-pc-windows-gnu)	4m 44s
build-windows-master	0s
build-windows-pr (release, x86_64-pc-windows-msvc)	4m 41s
build-macos-x86_64 (dev, x86_64-apple-darwin)	14m 52s
build-linux-pr (dev, x86_64-unknown-linux-gnu)	6m 49s
build-windows-pr (release, x86_64-pc-windows-gnu)	6m 16s
build-macos-x86_64 (release, x86_64-apple-darwin)	5m 23s
build-linux-pr (dev, armv7-unknown-linux-gnueabihf)	56s
build-windows-stable	0s
build-linux-pr (dev, aarch64-linux-android)	1m 3s
build-linux-pr (release, x86_64-unknown-linux-gnu)	2m 31s
build-all-features (x86_64-unknown-linux-gnu)	4m 50s
build-linux-pr (release, armv7-unknown-linux-gnueabihf)	1m 49s
build-linux-pr (release, aarch64-linux-android)	2m 0s
build-freebsd-master	0s
build-freebsd-stable	0s
build-linux-master	0s
build-linux-stable	0s
build-macos-aarch64 (dev, aarch64-apple-darwin)	11m 30s
check	3m 15s
build-macos-aarch64 (release, aarch64-apple-darwin)	1m 31s
doc	8s
conclusion	1s
	1h 35m 13s

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