Remove opaque type on function iter() of IArray

[cecton]

This change is necessary for me to work on NodeSeq on Yew as there is an trait
there that is impossible to implement if the iter() method here returns an
opaque type.

-impl<IN, OUT> IntoIterator for NodeSeq<IN, OUT> {
+impl<IN, OUT: ImplicitClone + 'static> IntoIterator for NodeSeq<IN, OUT> {
     type IntoIter = std::vec::IntoIter<Self::Item>; // this should be the "Iter" type of IArray
     type Item = OUT;
 
     fn into_iter(self) -> Self::IntoIter {
-        self.0.into_iter()
+        self.0.iter().collect::<Vec<_>>().into_iter() // terrible temporary workaround
     }
 }

[kirillsemyonkin]

I don't have anything to say without first hand experience on the issue I guess. Seems fine to me though