crypt: support timestamped filenames from --b2-versions

With the file version format standardized in lib/version, `crypt` can
now treat the version strings separately from the encrypted/decrypted
file names. This allows --b2-versions to work with `crypt`.

Fixes #1627

Co-authored-by: Luc Ritchie <luc.ritchie@gmail.com>
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