An interface to specify the configuration of the filemanager.
The implemented object has to fill the FilemanagerConfig. This configuration object is
used to dispatch the configuration settings to the implementation of the Connector.
Hint: You are free to implement this interface the way you need it,
in other words your return values can be global, regardless of the request, or on a per-request basis.
For example, it would be possible to build a separate configuration for each user. But the 'icons'-section
should *not* be changed!