World props: camps and work in the wild

Model and bake the 128 sprites of group camps of the world-props order (assets/requests/world-props/camps.md, brief assets/requests/world-props.md) on their own branch. Done when every sprite of the list is in assets/manifest.d/world_camps.toml, baked and reviewed on a gallery sheet.

All 128 sprites are in assets/manifest.d/world_camps.toml, baked and reviewed on gallery sheets per family (tents, fires, furniture, racks, orcs, carts, supplies, defences, woodcutters, mines, wilds); every script passes check_lattice.