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If we are unable to filter a page's content streams, don't attempt to remove objects from the page's resource dictionary. Also provide a command line option to suppress resource removal in case we ever need this as a workaround for some bug or broken PDF files.
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This is the beginning of higher-level API support using helper classes. The goal is to be able to add more helpers without continuing to pollute QPDF's and QPDFObjectHandle's public interfaces.