I corrected documentation for "pruneFileTree" which does not delete folders containing files (but
does delete empty directories and directories containing empty directories).
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Also it didn't appear to delete all the files.
Also the prune branch doesn't give any feedback.
This properly handles ro_cache.txt files found deep within the filesystem. This provides a monitor now and is run off of the event thread.
I corrected documentation for "pruneFileTree" which does not delete folders containing files (but
does delete empty directories and directories containing empty directories).
Don't show .meta directories in the file tree, since these are used to store file hashes and timestamps.