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/playingcard.go

@@ -0,0 +1,25 @@
+package tabletop
+
+import (
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type PlayingCardOptions struct {
+	// Back shows the card face down.
+	Back bool
+}
+
+// PlayingCard is a card: rank and suit, or its back.
+func PlayingCard(c *ui.Context, cd Card, o PlayingCardOptions) *ui.Element {
+	k := pixel.K(c)
+	cd.check("PlayingCard")
+	name := cd.name(k)
+	if o.Back {
+		name = k.Msg("card_back")
+	}
+	return ui.Box(c).Size(k.D(cardW), k.D(cardH)).Role(ui.RoleImage).Label(name).Draw(func(p *ui.Painter, r ui.Rect) {
+		drawCard(k.Canvas(p, r), 0, 0, cd, o.Back)
+	})
+}