rustc: Remove ~[T] from the language

The following features have been removed

* box [a, b, c]
* ~[a, b, c]
* box [a, ..N]
* ~[a, ..N]
* ~[T] (as a type)
* deprecated_owned_vector lint

All users of ~[T] should move to using Vec<T> instead.
auto merge of #14703 : alexcrichton/rust/no-more-owned-vectors, r=brson

The following features have been removed

* `box [a, b, c]`
* `~[a, b, c]`
* `box [a, ..N]`
* `~[a, ..N]`
* `~[T]` (as a type)
* deprecated_owned_vector lint

All users of ~[T] should move to using Vec<T> instead.