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
The old way of checking for focus loss caused GTK to be unable to
even open the combobox. This way checks for the event sent when the
list closes and uses that to close the grid editor.
Fixes https://gitlab.com/kicad/code/kicad/issues/4617
