OpenSystemsDevelopment / qpdf

… for improved code readability and maintainability.

… simplify logic. Update related test outputs and release notes.

Add new private-API class String

…` and replace with `String::utf16`.

Added `qpdf::String` class to encapsulate string operations. Updated `QPDFObjectHandle` string methods to utilize `qpdf::String`, streamlined empty string handling, and removed redundant test coverage entries.

…oved shared pointer handling, remove deprecated object methods, and update all references.

Refactor `qpdf-c` object handle management: replace `shared_ptr` with…

…DFObjectHandle` storage, remove unused trace calls, and streamline invalid handle checks.

Remove implementation detail from QPDF header file

…sages, and clean up `QPDF.hh`.

… and `findEndstream` to `Objects`, remove `QPDF::PatternFinder` class, and update related logic for improved encapsulation.

…, replace direct calls with `QIntC` equivalents, and clean up `QPDF.hh`.

Refactor `QPDFAcroFormDocumentHelper::traverseField`: add validation …

…t` consistency to handle invalid entries, and improve loop detection logic.

Refactor `QPDFAcroFormDocumentHelper`: simplify `traverseField`, remo…

…` parameter, update conditional checks, and streamline logic for field and annotation handling.

Tighten validation of the PDF spec requirements that form fields form a tree and that widget annotations have a single parent by utilizing `field_to` and `annotation_to_field` in the loop detection check.

Deprecate QPDF::compute_encryption_key

Refactor QPDFWriter configuration

…d calls, and streamline related logic for improved encapsulation and maintainability.

…with encapsulated `Config`, replace `qcf` with `d_cfg` for improved consistency, and adjust related logic for maintainability.

…shared` for progress reporters to improve clarity and efficiency.

…on` checks, consolidate parameter updates, and remove redundant code for improved clarity.

… parameter handling, and adjust related method calls for improved maintainability and readability.

…or `extension_level` in `setMinimumPDFVersion`, and update calls for improved encapsulation.

…date logic, and improve encapsulation.

…to `impl::Writer`, streamline initialization, and enhance encapsulation.

…nfig` struct, update member access to use `cfg`, and streamline related logic across `QPDFWriter`.

…c::Common`, and adjust related `QPDFWriter` logic for improved encapsulation.

…:Doc`, rename related methods, and streamline usage across QPDFWriter and linearization modules.

… `Objects`, and `Pages` to use it, and streamline initialization logic.

… declarations across the codebase for improved encapsulation.

Refactor `enqueueObject` to `enqueue`, update related method signatur…

…c across `QPDFWriter` for consistency and improved readability.