Respect .hidden file

[bruglet]

I know .hidden is a Nautilus-only implementation (afaik), but it would still be nice as it allows hiding certain folders and files created by apps that can't be renamed. (Without it being recreated again under the original name)

[jarun]

Sorry, we can't look for and if present, read the contents of a file on every directory load. Please use . to mark directories hidden.