TODO

   1 Baroque Berolina Bicolour Brotherhood
   2 For Baroque (and Fugue and...) --> maybe a dedicated parent class ?
   3
   4 Go game with option oneColor
   5
   6 add variants :
   7 Dark Racing Kings ? Checkered-Teleport ?
   8
   9 Hmm... non ? -->
  10 Otage, Emergo, Pacosako : fonction "buildPiece(arg1, arg2)" returns HTML element with 2 SVG or SVG + number
  11 ==> plus simple : deux classes, images superposées.