Refreshed generated files and updated TODO.org

  * TODO.org: add list of scripts that would be rewritten on lua;
  * bin: regenerate several scripts from they Org document, nothing new;
  * docs/scripts/ob-xs-handler.org: added meta-code for tangling code;
  * removed old scripts: series of 'mk-*'.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>