Log Message:
www/nsm: Update to version 1.25

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

Nift (aka nsm) v1.25
* changed the way @ is escaped and removed most escape characters
  (too likely to conflict in other places)
* added @ent syntax to template language
* added @\@, @\<, @\\ escaping syntax to template language
* improved reading parameters
* changed how strings/variables are done in preparation for more
  types (to come, type defs and function defs)
* now allow multiple string definitions in the one definition
* improved syntax for inputting tracked file and project/site
  information, now basically hard-coded constants
* fixed bug with delDir, which fixed bugs with clone etc.
* removed website specific terminology (lots of changes)
* added Nift command backup-scripts (option)
* changed one of the Nift config commands to info-config
* added Nift command info-tracking
* check if new content path etc. exist with new-cont-ext etc.
* check whether content file already exists when moving/copying
* make sure all tracks/untracks/rms will be successful before
  any of them are done