New Mod: No Rivtech Guns

When enabled, this mod blacklists Rivtech firearms and ammunition from
being created in the world or by the player.
disable auto-note by default
Merge remote-tracking branches 'dda/pr/7825' and 'dda/pr/7844' into dda-master

* dda/pr/7825:
  New Mod: No Rivtech Guns

* dda/pr/7844:
  disable auto-note by default