Add comprehensive changelog from v2.6.1 to v3.6.2#70

Copilot wants to merge 1 commit intomainorange-cpp/omath:mainfrom

copilot/fix-8b30874c-0738-4b98-9e55-dcbdfd0a48e8orange-cpp/omath:copilot/fix-8b30874c-0738-4b98-9e55-dcbdfd0a48e8Copy head branch name to clipboard