* 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
This adds a new CSRF manager for unit testing purposes, it's interface is based upon https://github.com/symfony/security-csrf. Due to some of our required custom changes it is however not possible to use the Symfony component directly.