* Fix: `Scanner` now uses indices of the respective UnicodeScalarView
* Fix: `Scanner` now uses indices of the respective UnicodeScalarView
* Extended test for Unicode `Combining Diaeresis`
* Fixed test for combining diaeresis
* Inlined template for testing Unicode combining diaeresis
Co-authored-by: Ilya Puchka <ilyapuchka@gmail.com>