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/dicetray.go

@@ -0,0 +1,39 @@
+package tabletop
+
+import (
+	"fmt"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type DiceTrayOptions struct {
+	// Cue rolls them all, as Dice's Cue does.
+	Cue int
+}
+
+// DiceTray holds several dice on felt, and their total.
+func DiceTray(c *ui.Context, text string, values []int, o DiceTrayOptions) *ui.Element {
+	k := pixel.K(c)
+	if len(values) == 0 {
+		panic("tabletop: DiceTray has no dice")
+	}
+	total := 0
+	for _, v := range values {
+		total += v
+	}
+	sum := fmt.Sprintf("%s %d", k.Msg("total"), total)
+	return ui.Column(c).Gap(k.D(4)).AlignItems(ui.Center).AlignSelf(ui.Start).Role(ui.RoleGroup).Label(text).Description(sum).Children(func() {
+		ui.Row(c).Gap(k.D(2)).Padding(k.D(6)).Draw(func(p *ui.Painter, r ui.Rect) {
+			g := k.Canvas(p, r)
+			g.Frame(0, 0, g.W, g.H, pixel.Sunken, pixel.Good)
+			g.Veil(2, 2, g.W-4, g.H-4, pixel.Shade, 4)
+		}).Children(func() {
+			for i, v := range values {
+				Dice(c, fmt.Sprintf("%s %d", text, i+1), v, DiceOptions{Cue: o.Cue})
+			}
+		})
+		pixel.Text(c, sum, pixel.TextOptions{})
+	})
+}