Use macros to implement traits for `Vec` and `VecView`. #729

Job	Run time
testmiri	55s
style	17s
clippy	13s
check (x86_64-unknown-linux-gnu)	26s
doc (x86_64-unknown-linux-gnu)	20s
check (i686-unknown-linux-musl)	18s
test	33s
check (riscv32imc-unknown-none-elf)	27s
check (armv7r-none-eabi)	17s
doc (thumbv7m-none-eabi)	28s
testcfail	49s
check (thumbv6m-none-eabi)	29s
check (thumbv7m-none-eabi)	45s
testcpass (x86_64-unknown-linux-gnu)	22s
check (thumbv8m.base-none-eabi)	31s
testtsan (x86_64-unknown-linux-gnu)	37s
check (thumbv8m.main-none-eabi)	25s
testcpass (x86_64-unknown-linux-gnu, --release)	13s
testtsan (x86_64-unknown-linux-gnu, --release)	42s
testcpass (i686-unknown-linux-musl)	35s
testcpass (i686-unknown-linux-musl, --release)	13s
	9m 55s

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