OpenSystemsDevelopment / qpdf

Simplify QPDFObjectHandle::isPageObject

Change QUtil::read_file_into_string to work with pipes (fixes #1010)

Check for missing mediaboxes

Maintain links to foreign pages when copying foreign objects (fixes #1003)

Ensure that links to foreign pages are not broken provided that the page is
subsequently copied.

… object (fixes #1011)

`basic_string<unsigned char>` implies use of
`char_traits<unsigned char>`.

This char_traits specialization is not standard C++, and will be
removed from LibC++ as of LLVM 18. To ensure continued LibC++
compatibility it needs to be removed.

There are two possible replacements here: `std::string` (e.g.
`std::basic_string<char>`), or `std::vector<unsigned char>`.

I have opted for vector since this code is dealing with a binary
buffer; though probably either way is fine (why does C++ even have
strings anyway??).

https://github.com/qpdf/qpdf/issues/1024

Ensure copied annotations are fixed (fixes #600)

 Add new Buffer method copy and deprecate copy constructor / assignment operator

Also fix accidental Buffer copy in Pl_LZWDecoder::addToTable.

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

Apply various Clang-Tidy rules

Remove redundant loop in QPDFWriter::prepareFileForWrite

Avoid unnecessary copying of stream dictionary in QPDF::readObject