OpenSystemsDevelopment / qpdf

… for improved code readability and maintainability.

…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.

… declarations across the codebase for improved encapsulation.

… `attempt_recovery` to `password_is_hex_key` and `suppress_recovery` to align with the CLI, update usage across the codebase, and streamline related logic.

…` methods, update usage across codebase, and streamline related logic.

…fields, replace direct member access across the codebase, and streamline related logic.

…te usage throughout the codebase, and streamline configurations.

…gin`/`end` methods, update calls across codebase, and streamline page handling logic.

Refactor `pages` method and related members in `QPDF::Doc` to `page_dh`. Update all associated references to reflect the change.

Relocate `JobSetter` to `QPDF::Doc` for improved encapsulation of job-related logic. Adjust all references to use the new placement.

Replace direct access to document helpers (`acroform()`, `pages()`, `embedded_files()`, etc.) with calls through `QPDF::doc()` for better encapsulation. Adjust related methods, constructors, and memory management accordingly.

…page label processing logic, centralize label handling, and adjust related resource management.

…ges` sets with vector<bool> `Input::copied_pages`, centralize page tracking logic, adjust page processing, and simplify resource management.

…input, centralize page range parsing, and simplify page processing.

…and replace it with a setter that directly sets `Input::password`, centralize password handling, simplify file processing, and adjust related logic in `handlePageSpecs`.

…input_entry`, centralize input file handling in `infile_name`, update `new_selection` logic, and simplify page range and input processing.

…gic in `handlePageSpecs` and `new_selection`, and simplify page processing.

…alize handling in `Files::process_all`, and simplify `handlePageSpecs`.

…file handling in `Inputs`, and simplify related logic.

…lePageSpecs` and `new_selection`, and simplify page specification handling.

…, replace redundant file warning logic in `handlePageSpecs`, and simplify resource management.

…zation, simplify `handlePageSpecs` and `new_section`, and streamline file processing logic.

…ce removal handling, and cleanup redundant code in `handlePageSpecs`.

…sing, and simplify page specification handling.

…date page handling logic in `Input`, and optimize page range processing.

…ing logic, and streamline password handling and verbose output.

…ine file handling and resource management logic.

…page_heap` and `page_spec_qpdfs`, simplify file handling, and improve code clarity.

…ange handling, and cleanup obsolete logic.

…n` method, and update logic for handling page specifications.

…ageDocumentHelper` dependency, simplifying page and form field operations, and updating test coverage.

…parameter, return success status, and streamline warning handling logic.

…based structure for page mapping, improve indexing logic, and clean up redundant variables.

…mline numeric range parsing, and clean up obsolete test coverage entries.

…minate redundant variables, and simplify underlay/overlay page handling logic.

…ges, replace redundant variables, and improve code readability.

…e number and index handling, update related logic accordingly.