Also pushes GetCornersInSequence() into EDA_SHAPE
so it can be shared between SCH_TABLE and PCB_TABLE.
Also fixes bug in drawing column rulings over the
right external border.
Also fixes a bug with dialog control enabling.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/20350
Also cleans up a misconception about table header borders,
and renames the getter/setter to be clearer.
Also makes sure that table cells are updated when the table
layer changes.
And another bug where we were writing the grey color value
back to the cell for hidden cells.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/20319
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
