message: Write docs for `iced_winit::Clipboard`
  Also explicitly allow the missing debug implementation.
diff: +/// A buffer for short-term storage and transfer within and between
  +/// applications.
  +#[allow(missing_debug_implementations)]
  pub struct Clipboard(window_clipboard::Clipboard);
  impl Clipboard {
  + /// Creates a new [`Clipboard`] for the given window.
  + ///
  + /// [`Clipboard`]: struct.Clipboard.html
  pub fn new(window: &winit::window::Window) -> Option<Clipboard> {
  window_clipboard::Clipboard::new(window).map(Clipboard).ok()
  }
  