[tools] Fix http signature missing header logic.
[tools] Simplify a callback.
[tools] Add resource info tool.

This tool retrieves, parses, and displays information about a resource
(stdin, file, or HTTP/HTTPS). It is useful for debugging the information
a PaySwarm Authority will use.

- Can perform JSON-LD framing of Assets, Licenses, and Listings.
- Can output framed data, data hash, and/or normalized data.
[tools] Add raw data display option.

Display raw resource data compacted with default PaySwarm context.