'core' and 'settings' are just apps but we treat them slightly
different. Make sure that we construct the correct namespace so we can
actually do automatic AppFramework stuff.
* 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
Roeland Jago Douma
Joas Schilling