[WIP] Upgrade to Rust 2018 and parser optimizations#16

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OtaK wants to merge 2 commits intodevelopfrom

feature/parser-optimization

Commits on Dec 14, 2018

Rust 2018 + Parser overhaul
Mathieu Amiot
committed

Commits on Feb 21, 2019

Update src/protocol/client/unsub_cmd.rs

o0Ignition0o
and
OtaK
authored