Add game components 246-268; data.DrawSlot, Canvas.TextVeil

Health, mana and experience bars, quarter hearts, lives, a spinning
coin counter, score board, stage timer, minimap with fog, compass,
hotbar, paper-doll equipment, skill tree, skill buttons with cooldown
wipes, status effects, a boss bar, damage numbers, quest log and
tracker, party frames, character sheet, level-up screen and shop.
data exports DrawSlot so every slot looks alike; pixel adds TextVeil
for dissolving text. Messages the font cannot draw are fixed and
TestMessagesHaveGlyphs holds every message to the font.

game/sprites.go

@@ -0,0 +1,72 @@
+package game
+
+import "git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+
+// coin spins: face, turning, edge on, turning back.
+var coin = pixel.MustSprite(`
+	............
+	...eeeeee...
+	..eyyyyyye..
+	.eyllyyyyye.
+	.eylyyeyyye.
+	.eylyyeyyse.
+	.eyyyyeyyse.
+	.eyyyyeyyse.
+	.eyyyyyyyse.
+	..essssssse.
+	...eeeeeee..
+	............
+
+	............
+	....eeee....
+	...elyyye...
+	..elyyyyse..
+	..elyeyyse..
+	..elyeyyse..
+	..eyyeyyse..
+	..eyyeyyse..
+	..eyyyyyse..
+	...essssse..
+	....eeeee...
+	............
+
+	............
+	.....ee.....
+	.....le.....
+	.....ye.....
+	.....ye.....
+	.....ye.....
+	.....ye.....
+	.....ye.....
+	.....ye.....
+	.....se.....
+	.....ee.....
+	............
+
+	............
+	....eeee....
+	...eyyyle...
+	..esyyyyle..
+	..esyyeyle..
+	..esyyeyle..
+	..esyyeyye..
+	..esyyeyye..
+	..esyyyyye..
+	..essssse...
+	...eeeee....
+	............`)
+
+// Hero is a small adventurer's head, the default life icon.
+var Hero = pixel.MustSprite(`
+	....rrrr....
+	...rrrrrr...
+	..rrrrrrrrr.
+	..eeeeeeee..
+	..elkllkle..
+	..elllllle..
+	..ellaalle..
+	...elllle...
+	....eeee....
+	...gggggg...
+	..ggeggegg..
+	..gg.gg.gg..`)