Performant and straight-forward implementation of Universally Unique IDentifier v4 (also called guid) generator

Exposes first class function from import com.github.jancajthaml.uuid, function uuid() generate 128bit UUID with cryptographically secure PRNG in format 8-4-4-4-12 lowercase hex digits.

• standard details http://www.ietf.org/rfc/rfc4122.txt
• entropy details https://en.wikipedia.org/wiki/Universally_unique_identifier#Random_UUID_probability_of_duplicates