Add a new Inheritence Layer to the Local Driver
There are many tasks which apply to all drivers working on an Hierarchical FileSystem (NFS, WebDav, LocalDriver, ....).
When it comes to security we want custom drivers not implent that all on their own, but provide it by the System.
Therefore create a new Class "AbstractHierarchicalFilesystemDriver" extending AbstractDriver as a new Base Class for LocalDriver and move the "general functions" one level up. Doing so we can extend it with some security and cleanup things there.