TODO

   1 PROBABLY WON'T FIX:
   2 Embedded rules language not updated when language is set (in Analyse, Game and Problems)
   3 If new live game starts in background, "new game" notify OK but not first move.
   4
   5 NEW VARIANTS:
   6 http://history.chess.free.fr/rollerball.htm
   7   https://www.chessvariants.com/40.dir/rollerball/index.html
   8 https://www.pychess.org/variant/shogun
   9 https://www.chessvariants.com/incinf.dir/bario.html
  10   https://www.chessvariants.com/index/listcomments.php?order=DESC&itemid=Bario
  11   https://www.bario-chess-checkers-chessphotography-spaceart.de/
  12   https://le-cdn.website-editor.net/20ef5f800ea646c29f6852cfc5ceda07/dms3rep/multi/opt/BAR028-e15a849c-960w.jpg
  13
  14 Non-chess: ( won't add draughts: https://lidraughts.org/ )
  15 Avalam, Fanorona https://fr.wikipedia.org/wiki/Fanorona
  16 Yoté https://fr.wikipedia.org/wiki/Yot%C3%A9 http://www.zillionsofgames.com/cgi-bin/zilligames/submissions.cgi/92187?do=show;id=960
  17 Qoridor: reserve moves to place the walls, convention from left / from top