Metaworlds Mod

- ladders on subworlds are working again - added gradual decay of traction (e.g. players are not blown off instantly) - fixed a freeze bug - fixed chests and other tile entities not rendering on subworlds - added stop-movement and reset-scale buttons to the admin gui - fixed a possible cause of crashes when creating a new subworld - more changes to improve compatibility with other mods - subworld velocities are also saved now