Recommendation is to avoid using the year nomenclature as this information is already encoded in the git repo. Avoids needing to repeatly update. Also updates AUTHORS.txt from current repo with contributor names
We are using C++14 where there is no reason for this and is banned in C++20 under P1766R1. MSVC generates a warning under C++14 as a reminder.
Fixes https://gitlab.com/kicad/code/kicad/issues/8245
