auto merge of #12348 : brunoabinader/rust/libcollections-list-refactory, r=alexcrichton

This PR includes:
- Create an iterator for ```List<T>``` called ```Items<T>```;
- Move all list operations inside ```List<T>``` impl;
- Removed functions that are already provided by ```Iterator``` trait;
- Refactor on ```len()``` and ```is_empty``` using ```Container``` trait;
- Bunch of minor fixes;

A replacement for using @ is intended, but still in discussion.

Closes #12344.