replace explain-error with clarify-error

[staltz]

Context

1. I'd like to use explain-error more often because conceptually it's a neat idea that should A LOT help us when debugging
2. I had some free time so I wanted to do something small and fun

Problem

explain-error is useful, but it's a bit buggy (when errors don't have a stack it produces a useless "stackless error" string) and it's quite outdated.

Solution

I rewrote the library as clarify-error and it's mostly compatible with explain-error, with the differences:

• Written in TypeScript (means it probably handles all corner cases better)
• 100% test coverage
• A few bytes smaller
• Renders stackless errors in a nicer way, see below

Before

throw explain('foo', 'bar')

Error: stackless error
    at module.exports (/home/staltz/oss/explain-error/index.js:18:19)
    at Object.<anonymous> (/home/staltz/oss/explain-error/example.js:10:7)

After

throw clarify('foo', 'bar')

Error: bar
    at Object.<anonymous> (/home/staltz/oss/clarify-error/example.js:10:7)
  Error: foo

[arj03]

Oh this is really good. Nice work. Starred the clarify-error repo. These bad stack traces has been a problem in the SSB stack for a long time.

[staltz]

I might still replace this PR, see staltz/clarify-error#1

[staltz]

Unfortunately pony-cause doesn't support stackless errors so let's go with clarify-error. 🚀