perf: reduce memory allocations

This also changes `widget::column::with_children` and
`widget::row::with_children` to take an `impl IntoIterator` instead
of a `Vec`, like the `iced` variants of these functions do.

This shouldn't be a breaking change since passing in a `Vec` will still
compile and function exactly as before.

(Using `iced::widget::Column::from_vec` or
`iced::widget::Row::from_vec` isn't possible, since the elements of the
`Vec` aren't checked, so the size of the resulting `Column` or `Row`
won't adapt to the size of its children. Perhaps a new function could
be added to mirror `iced`'s?)

src/applet/token/wayland_handler.rs

@@ -162,8 +162,8 @@ pub(crate) fn wayland_handler(
         exit: false,
         tx,
         seat_state: SeatState::new(&globals, &qh),
-        queue_handle: qh.clone(),
         activation_state: ActivationState::bind::<AppData>(&globals, &qh).ok(),
+        queue_handle: qh,
         registry_state,
     };