OpenSystemsDevelopment / qpdf

Also, modernize for loop.

Instead of overwriting cur_row.data() use clear and insert.

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.

Sparse arrays are rare. Dynamically create the variables needed to manage
them only when needed.

This commit contains the changes from generate_auto_job based on
manual changes from the previous 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.

Positional arguments are supported in a backward-compatible way, but
completion no longer guides users to it.

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

Also, don't search for /Contents name unless the result is used.

The new method is temporarily an (almost) complete copy of parse, which is
temporarily (almost) unchanged.

Having it at compile time breaks cross-compilation and isn't really
right anyway.

 Change JSONHandler::m to std::unique_ptr and declare Members in implementation file