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/logic_internal_test.go

@@ -0,0 +1,37 @@
+package tabletop
+
+import "testing"
+
+func TestAnswerWinsBlocksThenFills(t *testing.T) {
+	for _, tc := range []struct {
+		b    [9]int
+		want int
+	}{
+		{[9]int{2, 2, 0, 1, 1, 0, 0, 0, 0}, 2},
+		{[9]int{1, 1, 0, 0, 2, 0, 0, 0, 0}, 2},
+		{[9]int{1, 0, 0, 0, 0, 0, 0, 0, 0}, 4},
+		{[9]int{0, 0, 0, 0, 1, 0, 0, 0, 0}, 0},
+		{[9]int{1, 2, 1, 2, 2, 1, 0, 1, 0}, 8}, {[9]int{1, 2, 1, 1, 2, 2, 2, 1, 0}, 8},
+	} {
+		if got := answer(tc.b); got != tc.want {
+			t.Errorf("answer(%v) = %d, want %d", tc.b, got, tc.want)
+		}
+	}
+}
+
+func TestFullSeesEveryLine(t *testing.T) {
+	lines := [][]int{{0, 1, 2, 3, 4}, {2, 7, 12, 17, 22}, {0, 6, 12, 18, 24}, {4, 8, 12, 16, 20}}
+	for _, l := range lines {
+		var m [25]bool
+		for _, i := range l[:4] {
+			m[i] = true
+		}
+		if full(&m) {
+			t.Fatalf("four of %v is full", l)
+		}
+		m[l[4]] = true
+		if !full(&m) {
+			t.Fatalf("%v is not full", l)
+		}
+	}
+}