Delete unused files and commented-out code blocks (#68)

* Delete unused file `utf32_string.rs`

* Delete unused file `matcher.rs`

* Delete unused commented-out code block

Author: alexrutar

Diff for: matcher/src/debug.rs

@@ -1,24 +1,6 @@
 use crate::matrix::{MatrixCell, ScoreCell};
 use std::fmt::{Debug, Formatter, Result};
 
-// impl<C: Char> MatcherData<'_, C> {
-//     pub fn rows(&self) -> impl Iterator<Item = MatrixRow> + ExactSizeIterator + Clone + Sized {
-//         let mut cells = &*self.cells;
-//         self.row_offs.iter().map(move |&off| {
-//             let len = self.haystack.len() - off as usize;
-//             let (row, tmp) = cells.split_at(len);
-//             cells = tmp;
-//             MatrixRow { off, cells: row }
-//         })
-//     }
-
-//     pub fn haystack(
-//         &self,
-//     ) -> impl Iterator<Item = HaystackChar<C>> + ExactSizeIterator + '_ + Clone {
-//         haystack(self.haystack, self.bonus, 0)
-//     }
-// }
-
 impl Debug for ScoreCell {
     fn fmt(&self, f: &mut Formatter<'_>) -> Result {
         write!(f, "({}, {})", self.score, self.matched)