OpenSystemsDevelopment / qpdf

Now that there aren't any more...

This fixes cases of warning C4800 from msvc

This makes all integer type conversions that have potential data loss
explicit with calls that do range checks and raise an exception. After
this commit, qpdf builds with no warnings when -Wsign-conversion
-Wconversion is used with gcc or clang or when -W3 -Wd4800 is used
with MSVC. This significantly reduces the likelihood of potential
crashes from bogus integer values.

There are some parts of the code that take int when they should take
size_t or an offset. Such places would make qpdf not support files
with more than 2^31 of something that usually wouldn't be so large. In
the event that such a file shows up and is valid, at least qpdf would
raise an error in the right spot so the issue could be legitimately
addressed rather than failing in some weird way because of a silent
overflow condition.

This is the type we need for the underlying zlib implementation.

Change from unsigned long to int since we pass enumerated type values
to this field.

Based on sizeof(size_t). Assumes 64 if not 32.

Bounding box X coordinates could be truncated, causing them to be off
by a fraction of a point. This was most likely not visible, but it was
still wrong.

Temporarily skip fuzz tests on Windows. There are Windows-specific
failures to address later.

This is the set of files from the latest corpus of running the older
fuzzer (qpdf_read_memory_fuzzer) at the time of adding the new fuzzer
(qpdf_fuzzer) after running a merge operation to minimize the corpus.

There are more to handle, but this resolves an issue already caught by
oss-fuzz.

On read, ignore /DecodeParms when empty list; on write, delete it.
Some files have been found that include an empty list for
/DecodeParms, but this is not technically compliant with the spec, and
the only sensible interpretation is to treat it as if there are no
decode parameters.

Remove dependency on the behavior of perl for reliable creation of
Unicode file names on Windows.