To-do list

Add tests for:
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.

Add yank commands like yh/yj/yk/yl as well and test them too.