bs-prettify

Why?

This tool is built so the javascript output from Bucklescript could be more
human-readable.

Ugly syntax such as:

``js
var task = / record / [/ data / data, / callback / callback];
`

will be converted to:

`js
let task = {
data: data,
callback: callback
};
`

Checklist

- [x] Convert record creation code to object.
- [x] Remove / () /0 filler
- [x] Convert record access code to object access code.
- [x] Convert Curry related code into uncurried code.
- [x] Remove dll.length = (dll.length - 1) | 0; cast
- [ ] Remove String() constructor.
- [ ] Convert Belt.Option related code to plain undefined.
- [ ] Create Option.map` API in utils.