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
Graphic items (segments, rects, circles) on Edge.Cuts can create issues when
building board outlines, when they are very small (a few nm in size), because
they are not easily handled when trying to search connected graphics.
Also protect RC_ITEM::SetItems() against null pointer.
Fixes#15865https://gitlab.com/kicad/code/kicad/-/issues/15865
It shows much more detail. Removes some nag dialogs and places
hypertext links in others.
Also fixes the auto-layer-showing to correctly show Edge.Cuts or
F.CrtYd or B.CrtYd for errors relating to them.
Fixes https://gitlab.com/kicad/code/kicad/issues/6446