Add data components 151-175; clear MyGo row highlights

Lists, tables, trees, grids, inventories and records in data/.
Outline and GridView build on ui.List: ui.Outline strokes its arrows
and ui.GridView spaces and tints items. The pixel theme keeps MyGo's
row highlights clear so scrolled rows stay on whole dots; off lists
take a veil against the wheel. Adds Canvas.Silhouette, SwitchOptions
Label and exports Rarity.Slot.

data/list.go

@@ -0,0 +1,60 @@
+package data
+
+import (
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type ListOptions struct {
+	// Height is in dots; zero means 120.
+	Height   int
+	Disabled bool
+}
+
+type ListResult struct {
+	Element *ui.Element
+	// Submitted is Enter or a double click on a row.
+	Changed, Submitted bool
+}
+
+type listKey struct{}
+
+// List is a virtual list; ▶ marks the chosen row.
+func List(c *ui.Context, text string, n int, selected *int, o ListOptions, row func(i int)) ListResult {
+	k := pixel.K(c)
+	off := o.Disabled || pixel.Current(c).Inert
+	box := ui.Box(c)
+	st := ui.Local(box, listKey{}, func() ui.ListState { return ui.ListState{} })
+	st.Selected = selected
+	if off {
+		st.Selected = nil
+	}
+	var e *ui.Element
+	box.Children(func() {
+		e = ui.List(c, st, n, pixel.Lazy(c, func(i int) {
+			on := i == *selected
+			// The chosen row is AccentLit under a ▶.
+			ui.Row(c).FillWidth().Padding(k.D(1), k.D(2), k.D(1), k.D(12)).Draw(func(p *ui.Painter, r ui.Rect) {
+				if on {
+					g := k.Canvas(p, r)
+					g.Rect(0, 0, g.W, g.H, pixel.AccentLit)
+					g.Sprite(3, (g.H-pointer.H)/2, pointer, 0, pixel.Accent, 1)
+				}
+			}).Children(func() { row(i) })
+		})).Height(k.D(pixel.Or("List Height", o.Height, 120))).Label(text)
+		veil(c, off)
+	})
+	pixel.Park(c, e, off)
+	if off {
+		e.Description(k.Msg("disabled"))
+	}
+	well(c, box, pixel.State{Focus: e.FocusRing(false).FocusVisible(), Disabled: o.Disabled})
+	res := ListResult{Element: box, Changed: e.Changed(), Submitted: e.Submitted()}
+	if res.Changed {
+		slog.Debug("8bit: list", "label", text, "selected", *selected)
+	}
+	return res
+}