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Add methods isNameAndEquals, isDictionaryOfType, isStreamOfType
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When adding a QPDFObjectHandle to an array or dictionary, if possible, check if the new object belongs to the same QPDF. This makes it much easier to find incorrect code than waiting for the situation to be detected when the file is written.
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Also improve behavior around direct vs. indirect resources.
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This results in a performance penalty of 1% to 2% when replaceObject and swapObjects are never called and a somewhat larger penalty if they are called, but it's worth it to avoid very confusing behavior as discussed in depth in qpdf#507.
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There are lots of things with /Kids that are not pages. Repair the pages tree, then do a reliable check.
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Also fix a bug in checking consistency of length for stream data providers. Length should not be checked or recorded if the provider says it failed to generate the data.
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Avoid calling finish() multiple times on the pipeline passed to pipeContentStreams. This commit also fixes a bug in which qpdf was not exiting with the proper exit status if warnings found while splitting pages; this was exposed by a test case that changed.
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Make some more methods in QPDFPageObjectHelper work with form XObjects, provide forEach methods to walk through nested form XObjects, possibly recursively. This should make it easier to work with form XObjects from user code.
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StreamDataProvider::provideStreamData now has a rich enough API for it to effectively proxy to pipeStreamData.
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Refactor removeUnreferencedResources to prepare for filtering form XObjects.
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Various PDF digital signing tools do not encrypt /Contents value in signature dictionary. Adobe Acrobat Reader DC can handle a PDF with the /Contents value not encrypted. Write Contents in signature dictionary without encryption Tests ensure that string /Contents are not handled specially when not found in sig dicts.
