Add a formatter to json

[dgud]

To aid debugging or storing a readable file, some sort of formatter is needed.

@michalmuskala

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[essen]

We often use ~0p when printing terms during debugging. This because the indent can greatly increase data size and kill performance (or the node). An equivalent for the JSON formatter would be appreciated. We can always pretty print it in an editor or on the command line later on if necessary.

[dgud]

The default encode/[1,2] already does that, i.e. creates a "string" without adding any whitespace characters?

This is a 50% slower and (memory consuming) variant for when you want print it formatted in the shell or file. Or do I not understand your comment?

[essen]

My bad I must not have completely woke up today. Please disregard my comment!