OpenSystemsDevelopment / qpdf

Use string_view parameters and call pipeline write methods directly.

Also, make QPDFObjectHandle(std::shared_ptr<QPDFObject> const&) public.

A new private overload of QPDF::makeIndirectObject breaks pikepdf's
build, so renaming function.

…ternal2 and copyObject2

copyObject2 repeats a second time what
new_obj = QPDFObjectHandle(obj->copy(true))
in shallowCopyInternal2 already did.

…ternal2 and copyObject2

Have separate versions for unsafeShallowCopy, shallowCopy and makeDirect.