OpenSystemsDevelopment / qpdf

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

…sed_after_compressed` in `QPDF::Doc::Objects`, update usage in `QPDF_linearization`, and streamline related logic.

…ate usage across `QPDF_linearization`, and streamline related logic.

…`Lin`, encapsulate optimization data within `Lin`, update usage across the codebase, and streamline related logic in `QPDF_linearization`.

…ed`, `check`, and `show_data` methods, update usage across the 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.

…for improved structure and better code locality.

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

… streamline error handling, and improve 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.

…lace manual checks with `no_ci_stop_if`, and utilize `emplace_back` for improved clarity.

…ndling, replace `QPDFObjectHandle` with direct type usage, and remove redundant `QTC::TC` calls.

…, remove redundant `QTC::TC` call, and simplify type usage.

…e handling to improve clarity and consistency.

…mplify control flow, and update method returns.

…lize type conversions, and improve clarity across multiple modules.

…ace manual index handling, revise min/max initialization to use `std::numeric_limits`, and optimize shared identifier assignments.

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

…r,  and revise enum initialization. Clean up unused error handling in linearization logic.

…bnail processing loop to ensure consistency.

…uring robustness against damaged PDFs.

…buffer handling and streamline compression.

Simplify `readObjectAtOffset` by splitting responsibilities into separate functions: `read_object_start` and a streamlined `readObjectAtOffset`. Remove redundant parameters and improve code readability, ensuring better modularity for object reading operations.

Converted multiple occurrences of `count()` to `contains()` throughout the codebase where the goal was to check key existence in containers. This improves code readability and aligns with modern C++ practices, particularly with C++20, making the intent more explicit and potentially aiding performance.

... and use it in QPDFWriter and QPDF::generateHintStream.

linearization parameter dictionary.

Spec states that that linearization parameter dictionary must be the first
object.