Make oacs-dav an optional dependency for the file-storage package
Callback implementations and folder registrations will happen only when the package is detected at startup. For existing installations, no action is performed, buit the oacs-dav package can now be deleted without complaints.
provided a helper proc to query the mapping of a generic icon name to a concrete
This function is necessary in boundary cases, where e.g. a display_template passes the generic name of the icon via template variables which have to be @-substituted before adp-tag resolution, which performs the regular icon name mapping (otherwise, the tag resolver receives e.g. ...name=@icon@...)