OpenSystemsDevelopment / qpdf

Introduce a new `--remove-acroform` option to remove the interactive form dictionary from the document catalog. Update related documentation, tests, and release notes to reflect this new feature.

Fixes #1403

Add a new configurable limit `--max-stream-filters` to address excessive stream filters in damaged or specially constructed PDFs. Update related documentation, tests, and release notes to reflect this feature.

Thanks to github user @cdosborn for the basic enhancement.

... to remove the /Root /StructTreeRoot and /MarkInfo entries.

This requires a special build option.

This is just QPDFJob wiring.

Accept --file and --range as named parameters in additional to
allowing positional arguments. This is in preparation for adding
additional flags.

This commit contains only the manual changes. It is separated for
clarity. This commit would not pass CI because it lacks the automated
changes, which appear in the next commit.

Rather than adding yet another flag that is almost never useful on its
own, just have --remove-restrictions disable digital signatures. The
operations are still separate in the API.

Add the command-line arguments. They don't do anything yet.

Avd xcsv brvtns.

* 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.

Also add stubs for top-level QPDF methods (createFromJSON,
updateFromJSON)

Update getJSON() methods and calls to them

Flatten everything to make it easier to map command-line flags to
json. The old structure was an illusion anyway because there was no
mechanism to enforce that things were in the right place. This also
helps with future flexibility.

Use "file" consistently for specifying a file path. We use "filename"
when adding attachments for a completely different purpose.