Add chess symbols (and related)

src/modules/sym.txt

@@ -616,6 +616,141 @@ suit
   .spade.filled ♠
   .spade.stroked ♤
 
+chess {
+    king
+      .white ♔
+      .white.r 🨉
+      .white.inv 🨞
+      .white.l 🨳
+      .black ♚
+      .black.r 🨏
+      .black.inv 🨤
+      .black.l 🨹
+      .neutral 🨀
+      .neutral.r 🨕
+      .neutral.inv 🨪
+      .neutral.l 🨿
+    queen
+      .white ♕
+      .white.r 🨊
+      .white.inv 🨟
+      .white.l 🨴
+      .black ♛
+      .black.r 🨐
+      .black.inv 🨥
+      .black.l 🨺
+      .neutral 🨁
+      .neutral.r 🨖
+      .neutral.inv 🨫
+      .neutral.l 🩀
+    rook
+      .white ♖
+      .white.r 🨋
+      .white.inv 🨠
+      .white.l 🨵
+      .black ♜
+      .black.r 🨑
+      .black.inv 🨦
+      .black.l 🨻
+      .neutral 🨂
+      .neutral.r 🨗
+      .neutral.inv 🨬
+      .neutral.l 🩁
+    bishop
+      .white ♗
+      .white.r 🨌
+      .white.inv 🨡
+      .white.l 🨶
+      .black ♝
+      .black.r 🨒
+      .black.inv 🨧
+      .black.l 🨼
+      .neutral 🨃
+      .neutral.r 🨘
+      .neutral.inv 🨭
+      .neutral.l 🩂
+    knight
+      .white ♘
+      .white.tr 🨆
+      .white.r 🨍
+      .white.br 🨛
+      .white.inv 🨢
+      .white.bl 🨰
+      .white.l 🨷
+      .white.tl 🩅
+      .black ♞
+      .black.tr 🨇
+      .black.r 🨓
+      .black.br 🨜
+      .black.inv 🨨
+      .black.bl 🨱
+      .black.l 🨽
+      .black.tl 🩆
+      .neutral 🨄
+      .neutral.tr 🨈
+      .neutral.r 🨙
+      .neutral.bl 🨝
+      .neutral.inv 🨮
+      .neutral.bl 🨲
+      .neutral.l 🩃
+      .neutral.tl 🩇
+    pawn
+      .white ♙
+      .white.r 🨎
+      .white.inv 🨣
+      .white.l 🨸
+      .black ♟︎
+      .black.r 🨔
+      .black.inv 🨩
+      .black.l 🨾
+      .neutral 🨅
+      .neutral.r 🨚
+      .neutral.inv 🨯
+      .neutral.l 🩄
+    equihopper
+      .white 🩈
+      .white.rot 🩋
+      .black 🩉
+      .black.rot 🩌
+      .neutral 🩊
+      .neutral.rot 🩍
+    amazon
+      .white 🩎
+      .black 🩑
+    empress
+      .white 🩏
+      .black 🩒
+    princess
+      .white 🩐
+      .black 🩓
+    koma
+      .white ☖
+      .white.inv ⛉
+      .black ☗
+      .black.inv ⛊
+    general
+      .red 🩠
+      .black 🩧
+    mandarin
+      .red 🩡
+      .black 🩨
+    elephant
+      .red 🩢
+      .black 🩩
+    horse
+      .red 🩣
+      .black 🩪
+    chariot
+      .red 🩤
+      .black 🩫
+    cannon
+      .red 🩥
+      .black 🩬
+    soldier
+      .red 🩦
+      .black 🩭
+}
+
 // Music.
 note
   .up 🎜