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Since the functionality of argument parsing has moved into QPDFJob, these classes no longer need to be public. Their methods still have to be in the library's binary interface so they can be tested in libtests.
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Why? The main methods that create them return smart pointers so that users can initialize them when needed, which you can't do with references. Returning pointers instead of references makes for a more uniform interface.
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Use named functions rather than just end() for clarity.
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All that's left now is input and output handling.
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This was used, but it no longer is, so let's not keep the extra complexity around.
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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.