Added ducks. Also added river spawns from GROUP_RIVER.
Adds lawn darts.
Make rivers draw from the river group pool instead of swamps.
Remove river spawns (another PR handles those).
Ducks now fear sound.
Restore '.' as a "FIRE" command under the new input scheme.
Fixes XXX category for throwing weapons.
Merge duckies.
Merge lawn darts.
Merge thrown weapon ammo description fix.
Merge '.' for firing fix.
Force reset every time the map is exited so that loading does not bloat the submap list size.
Fix on-exit segfault from attempting to go through 'do_turn()'