Update in response to feedback

- one configuration option: ignore_paths
- use shlex to parse option to support whitespace and in-line comments
- change option type to Tuple[str, ...]
- remove ignored directories from dirnames to prevent scanning

kittens/diff/main.py

@@ -655,7 +655,6 @@ def main(args: List[str]) -> None:
     opts = init_config(cli_opts)
     set_diff_command(opts.diff_cmd)
     lines_for_path.replace_tab_by = opts.replace_tab_by
-    Collection.file_ignores = opts.file_ignores
     Collection.ignore_paths = opts.ignore_paths
     left, right = map(get_remote_file, (left, right))
     if os.path.isdir(left) != os.path.isdir(right):