Rust

Support `Zeroable` and `Pod` for `f16` and `f128` (#251) #532

Job	Run time
Test with -Zsanitizer=address	40s
Test Rust 1.34.0 on ubuntu-latest	1m 19s
Test with miri	1m 3s
Test with -Zsanitizer=memory	41s
Test on i686-unknown-linux-gnu with cross	1m 6s
Test Rust stable on ubuntu-latest	13s
Test with -Zsanitizer=leak	36s
Test Rust beta on ubuntu-latest	15s
Test Rust nightly on ubuntu-latest	20s
Test Rust stable on macos-latest	11s
Test Rust stable on windows-latest	27s
Test Rust stable-x86_64-gnu on windows-latest	36s
Test Rust stable-i686-msvc on windows-latest	48s
Test Rust stable-i686-gnu on windows-latest	38s
	8m 53s

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