v1.2.0

Clear all in the Island. Nothing is removed or changed in behaviour; the new texts, prop and close
reason are additive (see API).

Features

• With two or more notifications, the open Island ends its dots row with a Clear all button. The
  first press arms it: it takes the error tint and reads labels.clearAllConfirm(count) ("Clear 12"),
  spoken once through a status. A second press within 3 seconds closes every notification with the
  close reason 'clear-button' and acknowledges the missed count in the same commit, so nothing is
  left; focus returns to where it was before the Island. Waiting, leaving the button or collapsing the
  Island disarms it, and one double click never counts as both presses. Like clear(), it does not
  cancel tracked operations.
• Missed notifications now take a row of their own under the dots, which stay centred.

API

• New Toaster prop clearAll (default true); false hides the button.
• New close reason 'clear-button' in CloseReason. A switch over every reason now needs it;
  clear() keeps 'clear' and still leaves the missed count to acknowledgeOverflow().
• New texts labels.clearAll and labels.clearAllConfirm. An object typed as the full
  CloudletLabels now needs them; TypeScript points them out.
• New classNames part clear (button.cloudlet-clear, data-armed after the first press).