saner format for metadata --json

metadata --json output format has changed, adding a inner json object
named "fields" which contains only the fields and their values.

This should be easier to parse than the old format, which mixed up
metadata fields with other keys in the json object.

Any consumers of the old format will need to be updated.

This adds a dependency on unordered-containers for parsing MetaData
from JSON, but it's a free dependency; aeson pulls in that library.

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