@onlyworlds/sdk 4.7.2

Changed

• README first run finds Admiral Fluffington by name (the demo world's default list order moves with every edit, so "the first three" could not be promised); the npm page shows the corrected output.
• Schema repinned v0.30.2-dist.16 → v0.31.0-dist.18 (canonical 00.31.00).
  ONLYWORLDS_VERSION is now '00.31.00'. The World gains three optional free-text settings,
  length_unit, mass_unit and distance_unit; the nine element fields that promised "world
  LENGTH / MASS / DISTANCE units" now name them in their descriptions (Ability range, Character
  and Creature height and weight, Creature speed, Location elevation, Object and Species
  weight). No element field shape and no FIELD_SCHEMA entry changed. The world body is not
  typed per field (OwWorldMeta is open), so getWorld returns the three keys and patchWorld
  sends them with no code change; a test says so.