Add `try_from_` methods, rename some `from_` #31

Job	Run time
Check MSRV	1m 8s
Check (no-std) (armv7-unknown-linux-gnueabihf)	15s
Check (no-std) (thumbv7em-none-eabihf)	16s
Check	8s
Docs	18s
Lints	10s
Test suite	11s
	2m 26s

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