OpenSystemsDevelopment / qpdf

from "qpdf-v2" to "qpdf": [..., ...]

Remove any ambiguity around whether old or new value is being
returned.

Use 'QPDFObjGen const&' instead of 'int, int' in signature.

Move responsibility for creating shared pointers to objects and cloning from QPDFObjectHandle to QPDFObject.

We need to know whether pushInheritedAttributesToPage or getAllPages
have been called when generating JSON output. When reading the JSON
back in, we have to call the same methods so that object numbers will
line up properly.

When there is no context for writing output or error messages, use the
default logger.

This includes the output PDF, streams from --show-object and
attachments from --save-attachment. This also enables --verbose and
--progress to work with saving to stdout.

Remove variables obsoleted by commit 4f24617.

* native UTF-8 strings
* names whose PDF and canonical syntax differ in both dictionary key
  positions and other positions

For json, names are converted both as names and directly when used as
dictionary keys.

* Replace --create-from-json=file with --json-input, which causes the
  regular input to be treated as json.
* Eliminate --to-json
* In --json=2, bring back "objects" and eliminate "objectinfo". Stream
  data is never present.
* In --json-output=2, write "qpdf-v2" with "objects" and include
  stream data.

I decided these were confusing and inconsistent with how JSON works.
They muddle the API rather than improving it.

The last offset is irrelevant to not being able to find /Root.