Make tree sounds managed by the mod that defines the nodes in
question using register_ambient, consistent with other things like
fluids.
nc_envsounds is now responsible for just the air moving and
cave dripping sounds made by air itself.
Common windiness logic moved into api layer.
Much TODO:
- Primitive adze should not harvest trees whole; need to split into
planks from end only.
- Not entirely satisfied with crafting experience from gameplay nor
API perspective.
- Need an easier way to register these kinds of recipe checks.
- Need more gameplay actions to commmit a craft, e.g. have to pound
the tool head into place.
