rustyline for the cli

[IovoslavIovchev]

This PR addresses #464

[codecov]

Codecov Report

Merging #492 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #492   +/-   ##
=======================================
  Coverage   68.19%   68.19%           
=======================================
  Files         172      172           
  Lines       10573    10573           
=======================================
  Hits         7210     7210           
  Misses       3363     3363           

Impacted Files	Coverage Δ
boa_cli/src/main.rs	33.33% <ø> (ø)

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[Razican]

This looks very good. I have a couple of questions though. Should we use a history file for the console? And, should we print errors in red, for instance?

[IovoslavIovchev]

This looks very good. I have a couple of questions though. Should we use a history file for the console? And, should we print errors in red, for instance?

If you are wondering whether we should have a history feature for the REPL in the first place, maybe for now it could be an optional feature with conditional compilation?
As for the second question, I think it leads to a broader question - how much UX do we want for the REPL? There are definitely quite a few things that could be added. Maybe we should open a master issue with a checklist or something.