lib: Do better filtering of arguments, optional args particularly

* command.c: (cmd_deopt) helper to extract the inside argument string from
  an optional argument.

  (cmd_match) Consolidate matching code from cmd_filter_by_* to here.
  Use cmd_deopt to match on the /inner/ argument of an optional string,
  rather than treating optional arguments as matching pretty much any
  string.

  (cmd_filter) consolidate cmd_filter_by_* to here, and use cmd_match.
  Further, do a two-pass filter, to make use of the fact that we know
  the "strongest" match (e.g. range-match args beat variables) and can
  filter out weaker ones.

  Along with ability to match on inside of optional arguments, this makes
  our command definitions more powerful, and should allow us to avoid
  much redundancy in command defs.

  (is_cmd_ambiguous) look inside optional args, for better matching.

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