- Collapse all nodecore "core" mods in the /mods listing, so it's
easier to find the actual add-on mods.
- Parameterize in-game branding to make renaming derivatives just
a little easier.
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.
