To-do list

Add tests for:
- df<char>
- dF<char>
- dt<char>
- dT<char>
- delete inside word
Implement delete-around-word and test it
Reimplement % motion and d% motion.
- They should both search for the next character in any pair, the same way in Vim
- Add tests for reimplemented movements and motions
Reimplement di<symbol> and da<symbol>
- They should search for the next char in the specific pair, the same way in Vim
- Add tests for both
Afterwards, add tests for yanking.