feat: Auto-detect `FromStr`, `TryFrom<&OsStr>`, etc., in clap_derive#2298

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sunfishcode wants to merge 2 commits intoclap-rs:masterfrom sunfishcode:auto

+1,313-242

Commits on Jan 17, 2021

imp: Make clap_derive call FromStr::from_str only once per argument.
sunfishcode
committed

Commits on Jan 18, 2021

feat: Auto-detect FromStr, TryFrom<&OsStr>, etc., in clap_derive
sunfishcode
committed