OpenSystemsDevelopment / qpdf

Remove more deprecated API

Refine QPDFParser error handling

#1349 introduced a limit on the maximum size of arrays and dictionaries
contained in objects that generate errors during parsing, and #1354
reduced that limit to 5000 objects. However, the limit was only imposed
once a further error was encountered.

Stop adding objects to containers once the limit is reached.

Fixes oss-fuzz issue 398060137

Tune JSON::JSON_string

Fix typo in usage for fix-qdf

Deprecate QPDFTokenizer push mode

Remove member encoded and encode strings only when required.

Encoded is only used when writing JSON. Since most JSON writing is now
done on the fly without creating a JSON representation, creating and
storing the encoded string in almost all cases no longer serves any
purpose.

Push mode is not used by qpdf and is not tested. It is difficult to see a
legitimate use for it.

Continuing to support it creates unnecessary constraints and effort when
adapting the tokenizer.

Discontinue ChangeLog; update release notes as you go

In JSON::parse allow duplicate dictionary keys

Break ABI

If duplicate keys are encountered, overwrite earlier values with the latest
value.

Except for virtual functions to avoid the need for users to update code.

Also, move Buffer::Members definition to Buffer.cc

Also add debugging information so we can save time if $^O used in
GitHub Actions changes again.

This is necessary in case paths contain colons on Windows.

Fix build against a standard zopfli install

Fix the logic to accept a top-level `zopfli.h` header, as that is
the location used by upstream's build system.

Removing it was ABI-breaking. I must have done it forgetting Pl_DCT.hh
was in the public API.

This improves indentation of long strings. This commit also fixes some
trailing whitespace in ChangeLog.

Draft release notes

Refine QPDFParser error handling

Reduce the container size for which a single bad token will cause a failure
from 100,000 to 5,000.

Count missing dictionary keys as errors.

In Pl_RunLength apply memory limit before and after decoding