OpenSystemsDevelopment / qpdf

Change set visited to std::vector<bool>

Swap front and back, and change queue from list to vector

The old code didn't put one there, and it's not really useful. It just
makes the file (trivially) larger.

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

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.

This is converging into something that will be possible to do.

...when flattening annotations. This includes /Link, /Popup,
and /Projection.