OpenSystemsDevelopment / qpdf

…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.

Add new private Util.hh header to define inline functions and expose as
ordinary functions in QUtil.

Except for virtual functions to avoid the need for users to update code.

This improves indentation of long strings. This commit also fixes some
trailing whitespace in ChangeLog.

This reverts commit ff2a78f579ebdd06b417e34260a17dba06e71137, reversing
changes made to 8f54319f7a6514110f4b05cbbf1cb1c9fc8cb6a0.

This reverts commit c648b9a018105a3c30b3e7f3c5f8a058d3ddd92c, reversing
changes made to 12b67a3227df6b6df3a4f5f098e11cce173ff7d5.