OpenSystemsDevelopment / qpdf

I keep looking here to find out when I started requiring C++-11, and
now I will find the answer in the first place I look.

If a page contains a form XObject, also filter the form XObject and
remove its unreferenced resources.

Refactor removeUnreferencedResources to prepare for filtering form
XObjects.

fix-qdf assumes there is exactly one XRef stream and that it is at the
end of the file.

If the value of /CS in the inline image dictionary was is key in the
page's /Resource -> /ColorSpace dictionary, properly resolve it by
referencing the proper colorspace, and not just the name, in the
external image dictionary.

Allow exit status-based checking of whether a file is encrypted or
requires a password without necessarily supplying the correct
password. Useful for scripting.

Fix is based on guidance
https://support.microsoft.com/en-us/help/238187/cryptacquirecontext-use-and-troubleshooting
and is the proper fix for #285/#286

For wildcard expansion to work properly with the msvc binary, it is
necessary to link with setargv.obj or wsetargv.obj, depending on
whether wmain is in use.

Even though this is disallowed by the spec, files like this have been
encountered in the wild.