ChessHere bundled chess piece sets

Directory and file names are packaging choices.
Cburnett XML document type declarations were removed to avoid external DTD references.
Flat CC0, Font Awesome Chess, and Material Design Chess were recolored and given
contrasting outlines to produce separate white and black piece files.
License texts are in the LICENSES directory.

RhosGFX
Files: rhosgfx/*.svg
Author: RhosGFX
Source: https://github.com/lichess-org/lila/tree/master/public/piece/rhosgfx
License: CC0 1.0 Universal (LICENSES/CC0-1.0.txt)

Fantasy
Files: fantasy/*.svg
Author: Maurizio Monge
Source: https://github.com/lichess-org/lila/tree/master/public/piece/fantasy
License: MIT (LICENSES/MIT.txt)

Spatial
Files: spatial/*.svg
Author: Maurizio Monge
Source: https://github.com/lichess-org/lila/tree/master/public/piece/spatial
License: MIT (LICENSES/MIT.txt)

Celtic
Files: celtic/*.svg
Author: Maurizio Monge
Source: https://github.com/lichess-org/lila/tree/master/public/piece/celtic
License: MIT (LICENSES/MIT.txt)

Chessnut
Files: chessnut/*.svg
Author: Alexis Luengas
Source: https://github.com/lichess-org/lila/tree/master/public/piece/chessnut
License: Apache License 2.0 (LICENSES/Apache-2.0.txt)

Cburnett
Files: cburnett/*.svg
Author: Colin M.L. Burnett and Wikimedia contributors
Source: https://commons.wikimedia.org/wiki/Template:SVG_chess_pieces
License: BSD 3-Clause (LICENSES/BSD-3-Clause.txt)
The files were downloaded directly from Wikimedia Commons, whose file pages offer the BSD
3-Clause license as one of the selectable licenses. ChessHere elects the BSD 3-Clause option.
The GPL-labelled Lichess distribution is not the source of these files.

Firi
Files: firi/*.svg
Author: James Faure
Source: https://github.com/lichess-org/lila/tree/master/public/piece/firi
License: Creative Commons Attribution 4.0 International (LICENSES/CC-BY-4.0.txt)
Attribution: "Firi chess pieces by James Faure, licensed under CC BY 4.0."
Changes: None.

Kiwen Suwi
Files: kiwen-suwi/*.svg
Author: neverRare
Source: https://github.com/lichess-org/lila/tree/master/public/piece/kiwen-suwi
License: Creative Commons Attribution 4.0 International (LICENSES/CC-BY-4.0.txt)
Attribution: "Kiwen Suwi chess pieces by neverRare, licensed under CC BY 4.0."
Changes: None.

Livius
Files: livius/*.svg
Author: Martin Sedlák
Source: https://github.com/kmar/chess_svg_piece_sets/tree/main/livius
License: Public domain dedication (LICENSES/Public-Domain-Dedication.txt)
Changes: File names normalized to ChessHere's piece naming convention.

Flat CC0
Files: flat-cc0/*.svg
Author: femrek
Source: https://opengameart.org/content/chess-pieces-in-svg-format
License: CC0 1.0 Universal (LICENSES/CC0-1.0.txt)
Changes: Generated white and black variants with contrasting outlines; source file
"rok.svg" was renamed to the standard rook piece name.

Font Awesome Chess
Files: font-awesome/*.svg
Author: Fonticons, Inc.
Source: https://github.com/FortAwesome/Font-Awesome/tree/6.7.2/svgs/solid
License: Creative Commons Attribution 4.0 International (LICENSES/CC-BY-4.0.txt)
Attribution: "Font Awesome Free 6.7.2 by Fonticons, Inc., licensed under CC BY 4.0."
Changes: Generated white and black variants with contrasting outlines. Original
Font Awesome attribution comments are retained in every SVG.

Material Design Chess
Files: material-design/*.svg
Author: Pictogrammers contributors
Source: https://github.com/Templarian/MaterialDesign/tree/master/svg
License: Apache License 2.0 (LICENSES/Apache-2.0.txt)
Changes: Generated white and black variants with contrasting outlines.

Per-set licensing and authorship for Lichess-hosted assets:
https://github.com/lichess-org/lila/blob/master/COPYING.md