OpenSystemsDevelopment / qpdf

We don't put specific copyright banners on files that aren't installed.

This required moving some newly inlined functions back to the cc file,
but that seems to have had no measurable performance impact.

Avd xcsv brvtns.

Tidy QPDF::getAllPagesInternal and QPDF::pushInheritedAttributesToPageInternal

Also, modify QPDFObject::swapWith to update the ObjGens of the swapped
objects.

Modify QPDF::newIndirect and QPDF::updateCache to keep object ObjGens
up to date.

Modify QPDFParser::parse to call QPDF::getObject instead.

Add a new obj_cache entry or update an existing entry in place.

Also change QPDF::replaceObject and QPDF::swapObjects such that the
QPDFObject assigned to an og in the obj_cache is never replaced; only
QPDFObject::value is updated.

Centralise casting of QPDFObjects and reduce repeated dereferencing.

Allow QPDFObjectHandle::obj to be set prior resolving object.

ot_unresolved has been appended to the list object types in order to
preserve the output of existing test cases.

Report mem usage

Also remove no-longer-needed #include

Part of #729

Avoid creating new null objects that later will be discarded and made
implicit.

Part of #729

Part of #729

Part of #729

Replace SparseOHArray with std::vector<QPDFObjectHandle>.

Part of #729

Part of #729