OpenSystemsDevelopment / qpdf

…df::Dictionary`, update constructors, and streamline logic with `Dictionary` API.

…simplify iteration logic, update to use `Dictionary` API, and streamline error checks.

…with subscript operator, simplify logic, and improve error checks.

…h subscript operator, streamline `repair` with `Dictionary` initializer, and remove redundant semicolon.

…access, and streamline logic.

…y` with subscript operator, and simplify logic.

…`getKey` with subscript operator, and simplify logic.

…ictionary` APIs, replace `getKey` with subscript operator, streamline logic, and simplify bounds checks.

…y, and simplify implementation.

…erator[]`, and simplify null handling logic.

…actor implementation to simplify null handling and align with API conventions.

…ctionary key access, and simplify null handling logic.

- Added `Array::empty()` as a static method for creating empty arrays.
- Removed unused `Array(bool empty)` constructor and defaulted `Array` constructor.
- Updated `NNTree` methods to use `Array::empty()` for clarity and consistency.

- Marked `NNTreeIterator` and `NNTreeImpl` as `final` to prevent inheritance.
- Inlined `NNTreeIterator` and `NNTreeImpl` methods to streamline code and reduce redundancy.
- Updated constructors, operators, and utility functions in `NNTreeIterator` and `NNTreeImpl` for improved readability and maintainability.

- Added `const` qualifiers to member functions and parameters where applicable.
- Replaced `QPDFObjectHandle` arrays with `qpdf::Array` for improved type clarity.
- Simplified logic in `compareKeyItem` and `compareKeyKid` by removing redundant checks.

- Simplified the code by directly handling limits validation in `compareKeyKid`.
- Improved clarity by reducing unnecessary method indirection.

- Removed `NNTreeDetails` and moved key validation logic directly into `NNTreeImpl`.
- Replaced type determination with `qpdf_object_type_e` for improved clarity.
- Updated `QPDFNameTreeObjectHelper` and `QPDFNumberTreeObjectHelper` to align with the new `NNTreeImpl` structure.
- Simplified methods accessing tree items and validating keys.

…ated `acroform()` method and update related references for improved performance, consistency and maintainability.

- Introduced a `validate()` method in `QPDFNameTreeObjectHelper`, `QPDFNumberTreeObjectHelper`, and `NNTreeImpl`.
- Ensure proper validation of tree keys and values, detecting invalid entries, unsorted keys, and inconsistencies.
- Added support for auto-repair in case of validation errors.

- Introduced `std::function<bool(QPDFObjectHandle const&)>` to validate tree values.
- Updated constructors and methods across `QPDFNameTreeObjectHelper` and `QPDFNumberTreeObjectHelper` to support value validation.
- Refactored `NNTreeImpl` to check for invalid values during insertion, iteration, and retrieval.
- Improved error handling and reporting for invalid values.

… checking, and align with `Array` API conventions.

…prove bounds checking

…y, modify bounds checks, and adjust affected tests.

… to use subscript operators, and simplify object access logic.

…reamline object assignment, and introduce constructors for `QPDFObjectHandle`.

…eplace `getArrayNItems` with `size`, and improve error handling logic.

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

…edundant debug traces.

…and improve `findInternal` readability.

…`, and simplify member access.

…mplify control flow, and update method returns.

Refactor array handling in `QPDFObjectHandle`: replace `int` with `size_t` for size and index operations, introduce utility functions for type conversions, and simplify sparse array logic.

… warnings, and centralize utility methods.

… numbers and related variables, replacing `int`, to enhance consistency and avoid unnecessary checked conversions.