Add tabletop components 486-500 and ten game icons

Fifteen pieces of a games night: Dice, DiceTray, PlayingCard, CardHand,
Deck, Chessboard, GoBoard, MahjongTile, Domino, Roulette, CoinFlip,
BingoCard, TicTacToe, ScoreTrack and Meeple. Component number 500 is
a meeple, which seems right.

Dice tumble, coins turn and wheels spin on a cue, a frame at a time,
and land at once under Reduce Motion. Hands lift the card you point
at and play the one drawn on top; pieces and stones pick the lighter
of Lit and Ink for White, so they read in every palette; the computer
plays a fair O; FREE is a star in every language.

New 12x12 icons: Spade, Club, Diamond, Meeple, King, Queen, Rook,
Bishop, Knight and Pawn.

tabletop/domino.go

@@ -0,0 +1,39 @@
+package tabletop
+
+import (
+	"fmt"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type DominoOptions struct {
+	// Vertical stands the tile on end.
+	Vertical bool
+}
+
+// Domino is a tile of two halves of 0–6 pips.
+func Domino(c *ui.Context, a, b int, o DominoOptions) *ui.Element {
+	k := pixel.K(c)
+	if a < 0 || a > 6 || b < 0 || b > 6 {
+		panic(fmt.Sprintf("tabletop: Domino %d|%d", a, b))
+	}
+	w, h := 39, 20
+	if o.Vertical {
+		w, h = h, w
+	}
+	return ui.Box(c).Size(k.D(w), k.D(h)).Role(ui.RoleImage).Label(fmt.Sprintf("%d | %d", a, b)).Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		g.Frame(0, 0, w, h, pixel.Raised, pixel.Lit)
+		if o.Vertical {
+			g.HLine(3, 19, 14, pixel.Edge)
+			pips(g, 1, 1, 18, a, pixel.Ink)
+			pips(g, 1, 20, 18, b, pixel.Ink)
+			return
+		}
+		g.VLine(19, 3, 14, pixel.Edge)
+		pips(g, 1, 1, 18, a, pixel.Ink)
+		pips(g, 20, 1, 18, b, pixel.Ink)
+	})
+}