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There were two vet errors in two packages containing tests, resulting in
'go test' erroring out before any tests were run. Both were due to the
same reason - an Error method that ends up calling itself forever, thus
a panic.

While at it, 'gofmt -w -s' everything, which removes a redundant type.

The first two example fixtures of what I wanted to achieve pass now :3
That's exciting.

See the package docs in 'jst.go' for introduction to what and why;
tldr: I want pretty and I want JSON and I want them at the same time.

I'm putting this in the codec package tree because it fits there moreso
than anywhere else, but it's probably not going to be assigned a
multicodec magic number or anything like that; it's really just JSON.

This code doesn't *quite* pass its own fixture tests yet, but nearly.
I thought this would be a nice checkpoint because the only thing left
is dealing with the fiddly trailing-comma-or-not bits.

This first pass also completely ignores character encoding issues,
the correct counting of graphemes, and so forth; those are future work.
Most configurability is also speculative for 'first draft' reasons.
All good things in time.

This is something of a little hobby sidequest.  It's not particularly
related to the hashing-and-content-addressing quest usually focused.
Accordingly, as you may be able to notice from some of the comments
in the package documentation block, I did initially try to write this
over in the refmt repo instead.  However, I got about 20 seconds in on
that effort before realizing that our Node interface here would be a
wildly better interface to build this with.  Later, I also started
realizing Selectors would be Quite Good for other forms of
configuration that I want to add to this system... so, it's rapidly
turning into a nice little exercise for other core IPLD primitives!
Yay!  Copacetic.