draft: SVG renderer

[cymruu]

inspired by https://github.com/lichess-org/lila/issues/12514

result file: another example:

TODO:

• [x] field highlight
• [x] orientation
• [x] check highlighting
• [ ] player bars
• [ ] coordinates
• [x] board colors
• [ ] various piece themes support (most of them are broken for now)
• [ ] svg minification
• [ ] code cleanup
• [ ] ? arrows ?
• [x] size optimization - use svg defs to reuse piece paths https://developer.mozilla.org/en-US/docs/Web/SVG/Element/defs
• [x] use lila svg boards https://github.com/lichess-org/lila/blob/master/public/images/board/svg/