Make interactive text-based user-interfaces in OCaml

Port to dune/jbuilder, contributed by @rgrinberg.

v0.4 2017-11-12 Paris

Introduce an experimental Inuit_format module to integrate with stdlib
Minor: Inuit_base.utf8_length takes an optional offset.

v0.3 2017-10-09 Paris

Disable click on the right border of a region (cursor must be inside, not on
the border).
Tweak Widget.Tree api.

v0.2 2017-01-22 London

Update grenier dependency.
Remove some exotic unicode characters in widgets.
Indent tree by one character instead of two.

v0.1 2016-11-09 Paris

First release.