Add a macro to make initialization easier #282

Job	Run time
test	14m 57s
check (thumbv6m-none-eabi, nightly)	19s
check (thumbv7m-none-eabi, nightly)	19s
check (thumbv7m-none-eabi, stable)	19s
check (thumbv6m-none-eabi, stable)	18s
rustdoc	17s
Format	14s
Clippy	19s
	17m 2s

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