WIP:Correct deprecations warnings raised into Nodejs v10

Moulrequested to merge
nodejs10_deprecations into dev

https://stackoverflow.com/questions/52165333/deprecationwarning-buffer-is-deprecated-due-to-security-and-usability-issues

  • Consider Uint8Array as a string type

Unfortunately, this change introduces a bug: the PoW does no longer work.

Edited by Moul

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