Menu contains actions from the folders so we should
first delete the tray and the folders later.
Also change QHash in inotify watcher map to QMap as QHash
gives weird crashes with the inotify thread.
- If FolderWatcher receives a inotify event in less than 5
seconds from the last one, then the paths are queued and a timer
is setup for 5 seconds more. New events are queued if a timer
is running. The next event after the time gap is due will process
the full path list