Implement I/O safety traits #387

Job	Run time
Test (ubuntu-latest)	39s
MinimalVersions (ubuntu-latest)	22s
Test (macos-latest)	58s
MinimalVersions (macos-latest)	1m 15s
Test (windows-latest)	2m 27s
CheckTargets	1m 25s
MinimalVersions (windows-latest)	44s
Clippy	25s
Docs	7s
MSRV (ubuntu-latest)	13s
Rustfmt	10s
Nightly	25s
MSRV (macos-latest)	26s
MSRV (windows-latest)	26s
TestPoll	28s
TestWakerPipe	42s
Sanitizer (address)	55s
Check (aarch64-apple-ios)	34s
Sanitizer (leak)	51s
Check (aarch64-apple-tvos)	38s
Sanitizer (memory)	1m 41s
Check (aarch64-unknown-openbsd)	29s
Check (arm64_32-apple-watchos)	28s
Sanitizer (thread)	54s
Check (armv7-sony-vita-newlibeabihf)	42s
Check (sparcv9-sun-solaris)	29s
Check (x86_64-pc-solaris)	33s
Check (x86_64-unknown-dragonfly)	29s
Check (x86_64-unknown-openbsd)	30s
Passed	1s
	20m 26s

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