Represents a logical folder, which may be used to organise assets stored in the configured backend.

Unlike dataobjects, there is not necessarily a physical filesystem entite which
represents a Folder, and it may be purely logical. However, a physical folder may exist
if the backend creates one.
Additionally, folders do not have URLs (relative or absolute), nor do they have paths.
When a folder is moved or renamed, records within it will automatically be copied to the updated
Deleting a folder will remove all child records, but not any physical files.
See documentation for more details about the
relationship between the database and filesystem in the SilverStripe file APIs.