Extension:ChessBrowser/PGN schema

Description of standard


 * PHP should take import format and deliver export format.
 * JavaScript can be simplified by only accepting export format PGN. As the JavaScript is delivered by the extension, it should only take input that the PHP places on the page.
 * Parsing output can probably be done token by token without regexes
 * If extension is later expanded to resolve T239438, additional PHP function can take the export format and translate data for JavaScript