general purpose file indexer

[advdv]

With a file indexer it becomes possible to create events for individual file

• add indexing when adding multiple folders and subfolders
• add reindexing when removing multiple folders and sufbolders
• error on linux/windows when removing dir with files
• remove folder with file and then adding this folder with file again causes wrong event
• moving a file out of the monitored file tree is a recursive action (with recursive consequences) but only causes a single dir event (of the top dir)

monitor bugs

• dir events after a dir is moved out of the monitored tree are still emitted by linux but not on osx