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.

account/time_internal_test.go

@@ -0,0 +1,24 @@
+package account
+
+import (
+	"math"
+	"testing"
+	"time"
+)
+
+func TestSecondsLeftRoundsUpWithoutOverflow(t *testing.T) {
+	for _, tc := range []struct {
+		now    time.Time
+		period time.Duration
+		want   int64
+	}{
+		{time.Unix(0, 0), 30 * time.Second, 30},
+		{time.Unix(1, 0), 30 * time.Second, 29},
+		{time.Unix(29, 5e8), 30 * time.Second, 1},
+		{time.Unix(0, 0), math.MaxInt64, 9223372037},
+	} {
+		if got := secondsLeft(tc.now, tc.period); got != tc.want {
+			t.Errorf("%v into %v: %d s left, want %d", tc.now.Unix(), tc.period, got, tc.want)
+		}
+	}
+}