Add iterator that includes offset

[crowlKats]

It would be great if there would be a function with identical usage, but that also includes the byte offset in the iterator item. I need this because i need to remove some characters from a specific line, but cant because the byte offset i have (from .take(n).fold(0, |count, v| count + v.len())) would not take into consideration the bytes of the actual newlines characters.