Add account components 386-405; Reduce setting, PinInput Cmd+V

Twenty account components: SettingsList, OptionCycler, KeyBindings,
ControllerMap, ProfileCard, CharacterCreator, LoginForm, PasswordGrid,
SessionList, LanguagePicker, PalettePicker, VolumeMixer,
DifficultySelect, AccessibilityOptions, AccountSwitcher, PlayerSelect,
TwoFactor, About, PatchNotes and FeedbackForm.

The components never check credentials, and no secret reaches the log:
LoginForm reports Submitted and the caller counts Failures; each new
failure clears the password, refocuses it, shakes the form and names no
field. TwoFactor builds on input.PinInput and drains an epoch-aligned
period bar. PalettePicker draws each tile in its own palette on a
pixel.Pad grid.

pixel.Settings.Reduce stills motion like the system preference, the
micro font gains '?', display.Face draws avatar faces anywhere, and
input.PinInput pastes on Cmd+V as native hosts send it.

pixel/settings_test.go

@@ -189,3 +189,15 @@ func TestReduceMotionFollowsPreferences(t *testing.T) {
 		t.Fatal("Reduce off after ReduceMotion preference")
 	}
 }
+
+func TestReduceSettingStillsMotionInItsScope(t *testing.T) {
+	var outer, inner pixel.Kit
+	ui.NewTester(func(c *ui.Context) {
+		pixel.Use(c, pixel.Settings{Palette: pixel.SpringDay})
+		outer = pixel.K(c)
+		pixel.Scope(c, pixel.Settings{Palette: pixel.SpringDay, Reduce: true}, func() { inner = pixel.K(c) })
+	}, 10, 10)
+	if outer.Reduce() || !inner.Reduce() {
+		t.Fatalf("Reduce: outside %v, inside %v", outer.Reduce(), inner.Reduce())
+	}
+}