* Move a-b to PSR-4
* Move c-d to PSR-4
* Move e+g to PSR-4
* Move h-l to PSR-4
* Move m-r to PSR-4
* Move s-u to PSR-4
* Move files/ to PSR-4
* Move remaining tests to PSR-4
* Remove Test\ from old autoloader
Previously the regex was only matching on single characters. Meaning that file names such as "👍.txt" where possible while "👍" alone never was. This check apparently never worked as expected.
