This adds the ability to export the pin table content to a CSV file
or the clipboard as CSV, then re-import it from CSV or TSV. This allows:
* to round-trip pin table data via a spreadsheet program, so that the pin
data can be manipulated in a richer/more familiar editing environment
* an import method to bring in tabular pin data from other formats
"semi-automatically", without having to write a full-blown symbol generator.
Relates-To: https://gitlab.com/kicad/code/kicad/-/issues/19207
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