Add a macro to make initialization easier #284

Job	Run time
Clippy	18s
check (thumbv6m-none-eabi, nightly)	20s
check (thumbv6m-none-eabi, stable)	17s
Format	13s
check (thumbv7m-none-eabi, nightly)	18s
check (thumbv7m-none-eabi, stable)	17s
rustdoc	17s
test	1m 34s
	3m 34s

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