OpenSystemsDevelopment / qpdf

…lify `withinLimits` logic, and improve code readability with subscript operators.

…` and `getArrayNItems` with subscript operators for readability and cleaner syntax.

…edundant debug traces.

…and improve `findInternal` readability.

…dding error counting and leveraging `reconstructed_xref` for improved robustness, limiting the acceptable number of errors for damaged files.

…cess for consistency and readability.

Refactored several classes to use C++11 `final` specifiers for inheritance restrictions and added default member initializations. These changes enhance code clarity, improve safety, and ensure modern coding practices.

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

Avoid copying exceptions.

I decided these were confusing and inconsistent with how JSON works.
They muddle the API rather than improving it.

Change .clang-format and commit automated changes from a fresh run of
format-code

Remove the name/number tree object helper constructors that don't take
a QPDF&.

Add comments to force line breaks, parenthesize function arguments
that are contatenated strings, etc. -- these kinds of changes improve
clang-format's results and also cause emacs cc-mode to match
clang-format. After this type of change, most of the time, when
clang-format and emacs disagree, clang-format is better.

Run this:

for i in  **/*.cc **/*.c **/*.h **/*.hh; do
  clang-format < $i >| $i.new && mv $i.new $i
done

Keep a std::pair internal to the iterators so that operator* can
return a reference and operator-> can work, and each can work without
copying pairs of objects around.

Add constructors that take a QPDF object so we can issue warnings and
create new indirect objects.

Create a computationally and memory efficient implementation of name
and number trees that does binary searches as intended by the data
structure rather than loading into a map, which can use a great deal
of memory and can be very slow.