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Also fix QPDFArgParser
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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.
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Convert remaining static functions that take QPDFJob& as a parameter to member functions. Utility functions that don't take QPDFJob& remain static functions and can probably just stay that way since the keep extra complexity out of QPDFJob.hh.
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Remove remaining temporary duplication of hard-coded values and direct access to std::cout, std::cerr, and whoami in favor of parameters in QPDFJob. This moves a few more static methods into QPDFJob member functions.
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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.
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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.
