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.

input/play_test.go

@@ -126,6 +126,14 @@ func TestPinInputTypesBacksAndPastes(t *testing.T) {
 	if pin != "1298" || complete != 1 {
 		t.Fatalf("paste left %q, complete %d times", pin, complete)
 	}
+	// Native hosts paste on Cmd+V, as a key.
+	tt.Key(0, ui.KeyBackspace)
+	tt.Key(0, ui.KeyBackspace)
+	tt.SetClipboard("55")
+	tt.Key(ui.Cmd, ui.KeyV)
+	if pin != "1255" || complete != 2 {
+		t.Fatalf("Cmd+V left %q, complete %d times", pin, complete)
+	}
 	if _, ok := tt.TextCaret(); !ok {
 		t.Fatal("the boxes take no text from input methods")
 	}