Add new item vfs.file.get[file]

1. accepts any filesystem entry, such as file, directory, device, fifo (subject to OS limitations)
2. returns string in JSON format with the following attributes:
   1. file type (e.g. regular, directory, fifo)
   2. user owner (all platforms), group owner (Unix only)
      1. uid/gid/SID and numan-readable names must be included
   3. permissions (Unix only)
   4. file size in bytes (or size of blocks for directory, empty if not applicable)
   5. file change, access and modification time