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Create QPDFJob_options.cc to hold API implementation functions. Reorganize a little in preparation for moving public member variables private and creating the real QPDFJob API that will be used by callers as well as the argv/json initialization methods.
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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.
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Also fix QPDFArgParser
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Replace most of the calls to QUtil::copy_string with this instead.
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Handle optional choices in addition to required choices. Refactor the way help options are added to completion to make it work with optional help choices.
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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.
