feat: c8 ignore else

The original [issue logged for ignore rules](https://github.com/bcoe/c8/issues/21) asked for “all of them” but only `c8 ignore next` was added. I didn’t think that was much of a big deal until I realized [it takes 3 ignore next statements to ignore an `else` clause with only one line](https://github.com/mikeal/dagdb/commit/4a0bc0234ecf101f36937485c6c932eb06bbeed6#diff-a805d0759a758893fc82966a14c8ac34R93-R96). That’s actually pretty annoying, it would really help to get this in.