OpenSystemsDevelopment / qpdf

Add bad xref table test

Tune QPDFWriter

Update README-maintainer.md for clang-format-18

Fix manual entry for --pages

Fix pikepdf future CI

Ensure pikepdf is build with QPDF_FURURE enabled.

Create set without creation of an intermediate vector.

This triggers compilation failures with certain C++20 compiler configurations.

To avoid this I moved the cast to the loop's body.

For now, we are using codecov as an internal tool and not advertising
code coverage. I scrutinize coverage on include and libqpdf but don't
want to remove coverage reporting for other areas.

Add test for QPDFObjectHandle::isDirectNull

Add test for QPDFObjectHandle::getStreamJSON

As of this moment, if a specific commit's coverage data is uploaded to
CodeCov via a pull request, when that exact same commit builds in
main, the branch is not associated with the commit. I'm hoping this
might work around that.

Still need to handle upload artifacts, but that requires additional
changes.

Add additional sparse QPDF_Array tests