Link shares always allowed deletion, however internally the permissions
were stored as 7 which lacked delete permissions. This created an
inconsistency in the Webdav permissions.
This fix makes sure we include delete permissions in the share
permissions, which now become 15.
In case a client is still passing 7 for legacy reasons, it gets
converted automatically to 15.
* 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
