TsilCev

LinkedList on Vec. Add and remove O(1) amortized. It has a similar interface to LinkedList and similar to Vec.

Example

```rust use tsil_cev::TsilCev;

let mut tc = TsilCev::from(vec![5, 6, 7, 8, 9, 10]); tc.push_front(4);

let mut cursor = tc.cursorfrontmut(); assert_eq!(cursor.current(), Some(&4));

cursor.movenext(); asserteq!(cursor.current(), Some(&5));

cursor.remove(); assert_eq!(cursor.current(), Some(&6));

cursor.remove().remove().movenextlength(2); assert_eq!(cursor.current(), Some(&10));

cursor.moveprev(); asserteq!(cursor.current(), Some(&9));

let _ = tc.drainfiltertsil(|x| *x % 2 == 0).collect::>(); asserteq!(tc.tovec(), &[9]); ```