OpenSystemsDevelopment / qpdf

Code tidy QdfFixer methods

Refactor QdfFixer::processLines

Remove redundant parameter depth from QPDF::updateObjectMaps

Add new data member QPDFWriter::Members::root_og

Split QPDFJob::run into createQPDF and writeQPDF

Also, uninitialize QPDFWriter::Members members.

Also, change QPDFJob to use unique_ptr<QPDF> instead of shared pointers.

Change type of local var lines to string_view. Also, instead of
constructing a list of lines, read the entire input into a single string
and break it up into lines on the fly.stash

This reverts commit 56c923d1096b0317d978bdadeb44e8198053286c.

This commit breaks pikepdf.

Refactor removal of reserved objects in QPDF::JSONReactor

At the end of importing a JSON file, scan the object cache for reserved
objects and replace with null objects.

Recognise that JSON objects are effectively shared pointers to JSON_value.

Refactor setting of object descriptions in QPDF::JSONReactor