OpenSystemsDevelopment / qpdf

The previous commits have removed all references to memory from
QPDFArgParser from QPDFJob. This commit removes the constraint that
QPDFArgParser remain in scope. This is a prerequisite to allowing JSON
as an alternative way to initialize QPDFJob and to initialize it
directly using a public API.

Move ArgParser from qpdf.cc into QPDFJob.cc. It still works with
millions of public member variables, but now qpdf.cc is minimal and
just calls stable library functions.

Remove comparison of qpdf CLI version with library. With almost all
the functionality moving into the library, this check is no longer
meaningful.

Remove all calls to exit() from QPDFJob. Handle code that runs in
verbose mode to enable it to make use of output streams and message
prefix (whoami) from QPDFJob. This removes temporarily duplicated exit
code logic and most access to whoami/std::cout outside of QPDFJob
proper.

Move most of the methods called from qpdf.cc after argument parsing
into QPDFJob. In this increment, enough QPDFJob API has been added to
handle the branch of QPDFJob::run() that creates output with an
appropriate division between qpdf.cc and QPDFJob.

There are temporary bits of code to enable everything to compile and
pass the test suite, including some duplication and hard-coded values.

Ensure isOrHasName returns true if object is an array and the name is
present anywhere in the array.

Accept empty string as type parameter in
QPDFObjectHandle::isDictionaryOfType and isStreamOfType
to allow for dictionaries with optional type.

Commit by ejb@ql.org using m-holger as author so git annotate gives
proper credit for changes.

Add methods isNameAndEquals, isDictionaryOfType, isStreamOfType

They have to be ot_* rather than qpdf_ot_* for compatibility.

* Different enumerated types are not assignment-compatible in C++, at
  least with strict compiler settings
* While you can do `constexpr ot_xyz = ::qpdf_ot_xyz` in QPDFObject.hh to
  make QPDFObject::ot_xyz work, QPDFObject::object_type_e::ot_xyz will
  only work if the enumerated type names are the same.

Too bad about git annotate but it was pretty crazy to have all those
test cases together like that.

* Make it a runtime error, not a logic error
* Include additional information
* Capture it properly in checkLinearization

* Handle error conditions that occur when using the object handle
  interfaces. In the past, some exceptions were not correctly
  converted to errors or warnings.
* Add more detailed information to qpdf-c.h
* Make it possible to work more explicitly with uninitialized objects

It was exercised in the pdf-linearize example but not in qpdf-ctest.

Thanks for the nudge from m-holger!