Log Message:
www/nsm: Update to version 1.24

Changelog picked from https://github.com/nifty-site-manager/nsm/releases:

Nift (aka nsm) v1.24
Release Notes:
    * fixed bugs with content/page/script extensions and mv/cp/rm
      aka move/copy/del
    * updated/moved removePath to remove_path and remove_file and
      now removes now-empty directories
    * added in ^ option for @script syntax in template language
      for not making a backup copy
    * added in backupScripts to config files
    * added Nift commands track-dir, untrack-dir, rm-dir,
      track-from-file, untrack-from-file, rm-from-file (note when
      removing large volumes of pages using rm-from-file can cause
      significant machine lags while running and not long after)
    * added Nift commands watch, unwatch, info-watching
    * got rid of pre/post build-all and build-updated scripts,
      costs too much time and not really needed
    * added pre/post build scripts to page dependencies