So Plasmoid can use it as well
Allow viewing request URL and response of internal errors.
It is a common error that dirs can not be removed because they still contain ignored items. Usually I want to get rid of them nevertheless. This change allows to remove all non-empty Syncthing can not remove via the tray.
So settings pages, web view and other widgets can be used in other components such as the Dolphin plugin and Plasmoid, too.