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 "FreeBoard", re-using a lot of Board logic, but with SVG (empty) board + SVG (empty) reserves.
   6 Will be used for variants with custom non-rectangular board (Hex, at least)
   7 Or, with other board shapes (see greenchess.net for example)
   8
   9 Merge variants 1, 2 (3) into one with sub-variant selection when starting a game (New Game + vs engine + analyse)
  10 E.g. Checkered 1 & 2 into one, and so on.
  11 Need additional field in variant code... in a generic way (radiobutton or select or checkbox?)
  12
  13 #New variants:
  14 Chessplode
  15 Tablut
  16
  17 https://brainking.com/fr/GameRules?tp=128 Massacre Chess
  18
  19 CWDA : need game options (also useful at least for Monster)
  20 PizzaKings https://www.chessvariants.com/unequal.dir/pizza-kings.html
  21 https://en.m.wikipedia.org/wiki/Chess_with_different_armies#Pizza_Kings%5B11%5D_(John_Lawson)
  22
  23 https://www.chessvariants.com/other.dir/nemoroth.html :-)