tags: first cut at handling .txr files.

Handles only top-level define and bind.

* tags.tl (with-tag-shorthand-macro): New macro: a robot for
writing the the shorthand macrolet in collect-tags, so we can reuse it.
(process-form): New function, made from the bulk of
collect-tags.
(collect-tags): Renamed to collect-tags-tl. The macrolet is
replaced by invocation of with-tag-shorthand macro and the
form case processing logic by a call to process-form.
(process-clause, collect-tags-txr, collect-tags-guess): New
functions.
(toplevel): Help text updated. Process .txr files through
collect-tags-txr. Also process unsuffixed files, if they are
explicity mentioned on the command line, through
collect-tags-guess, which looks for hash-bang lines containing
the --lisp option.

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