OpenSystemsDevelopment / qpdf

…proved encapsulation.

Encapsulate linearization-related logic in `QPDF::Doc::Linearization`. Refactor methods, relocate implementations, and update all references accordingly to streamline and centralize linearization functionality.

Relocate `Objects` to `QPDF::Doc` for improved encapsulation of object-related logic. Adjust all relevant methods and references to use the new placement.

Relocate `Writer` to `QPDF::Doc` for better encapsulation of writer-related logic. Adjust all references to use the new placement.

…idate conditions, and enhance readability.

…oding flags, streamline filter logic, and simplify condition handling.

…ctionary handling, streamline filtering logic, and simplify length checks.

…gic, consolidate conditions, and enhance readability.

…e-returning overload, streamline calls, and simplify stream filtering checks.

…trailer handling, streamline trailer processing logic, and simplify related method calls.

…ream compression given that qpdf_mode is incompatible with linearization.

… `QPDF` parameter with `pdf` member, and simplify method calls.

…iter`, and simplify resource management.

…directives across modules to improve clarity and enforce better assertion practices.

…g encryption and update related tests.

…mbers`, update related logic, and clean up obsolete code.

…:Members`, update related logic, and remove obsolete declarations.

…StreamLength`, `computeDeterministicIDData`, and `calculateXrefStreamPadding` to `QPDFWriter::Members`. Update related logic and remove obsolete declarations.

…rs`, update encryption and stream handling logic, and remove obsolete test coverage entries.

…related logic, and remove obsolete test coverage entries.

…ueueObjectsStandard`, `enqueueObjectsPCLm`, `enqueuePart`, `assignCompressedObjectNumbers`, and `getTrimmedTrailer` to `QPDFWriter::Members`. Update related logic and remove obsolete test coverage entries.

…alStreams`, `preserveObjectStreams`, and `generateObjectStreams` to `QPDFWriter::Members`. Update related logic and remove obsolete test coverage entries.

…mbers` and update encryption parameter handling logic.

…bleIncompatibleEncryption` and `compareVersions` to `QPDFWriter::Members`. Remove outdated test coverage entries.

…d update initialization logic accordingly.

…n `QPDFWriter` and `QPDFJob`.

…logic in call to `initializeSpecialStreams`.

…ize`, and centralize `empty` checks.

…`warn`, streamline condition handling.

…or deterministic ID generation (fixes #1235).

…evel` and add `const&` to `child` parameter.

Replaced raw key pointer and length parameters with a `std::string` in `Pl_AES_PDF` and `Pl_RC4` constructors for improved safety and clarity. Updated all usage sites accordingly, reducing reliance on manual memory management and redundant conversions.

…proved clarity and reduced indirection in pipeline management.

…proved clarity and reduced indirection in pipeline management.

…n and improve separation of concerns.

…pping, remove redundant `PipelinePopper` usage, and improve encapsulation of MD5 handling.

# Conflicts:
#	libqpdf/QPDFWriter.cc

…implifying ID management and ensuring consistent initialization.