Added ducks. Also added river spawns from GROUP_RIVER.
Adds lawn darts.
suppress-chdir-warning
suppress-system-warning
fix-indentation
message fastfix
Debug menu short-range teleports no longer cause teleglow.
fixed about 100 warnings
Long-range teleports clear the vehicle cache.
Finish removing references to snares.
Fix snake break technique message for npcs.
Fixes price and weight of landmines.
Tweak.
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.
Cutting-Edge Primitive Technology: Stone Knives

Adds stone knives for primitive crafting. Re-commit due to the .cbp file fix being fixed by GalenEvil.
Add vehicle part curtains.

Curtains can be installed on vehicles using up a sheet, they can only be
opened or closed from inside the vehicle.
Force the player to be inside to open the curtain