Unicode Clusters

Unicode Clusters is a library that support variable width unicode characters as single items, allowing for array like indexing etc.

```rust

[test]

fn example() { let input = "AȜनमस्ते";

let gcs = GraphemeCluster::graphemes(input);
assert!(gcs.len() == 6, "length");

assert_eq!(gcs[0].as_string(), "A");

assert_eq!(gcs[1].as_string(), "Ȝ");
assert_eq!(gcs[2].as_string(), "न");
assert_eq!(gcs[3].as_string(), "म");
assert_eq!(gcs[4].as_string(), "स्");
assert_eq!(gcs[5].as_string(), "ते");

assert_eq!(gcs[0].as_bytes()[..], [65]);
assert_eq!(gcs[1].as_bytes()[..], [200, 156]);
assert_eq!(gcs[2].as_bytes()[..], [224, 164, 168]);
assert_eq!(gcs[3].as_bytes()[..], [224, 164, 174]);
assert_eq!(gcs[4].as_bytes()[..], [224, 164, 184,   224, 165, 141]);
assert_eq!(gcs[5].as_bytes()[..], [224, 164, 164,   224, 165, 135]);

} ```