(coll) retrofit ArrayDeque to implement List

ArrayDeque stores its elements in an array, but it doesn't implement the List interface. This means that it doesn't allow access to elements by index. It should be only a moderate amount of effort ot allow this, as mapping the list index into the array index is only a bit of arithmetic and logic.

The new methods that need to be implemented are:

void add(index, element)
boolean addAll(index, Collection)
E get(index)
int indexOf(Object)
int lastIndexOf(Object)
ListIterator listIterator()
ListIterator listIterator(index)
E remove(index)
E set(index, element)
List<E> subList(from, to)

Overrides for removeIf(), replaceAll(), and sort() default methods should probably be implemented.