Add a macro to make initialization easier #251

Job	Run time
test	1m 47s
check (thumbv6m-none-eabi, nightly)	19s
check (thumbv7m-none-eabi, stable)	24s
check (thumbv6m-none-eabi, stable)	23s
Clippy	21s
check (thumbv7m-none-eabi, nightly)	19s
rustdoc	16s
Format	14s
	4m 3s

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