Called when a segmented unit is created for any reason.
cause: defines.segmented_unit_created_cause — The reason that the segmented unit was created.segmented_unit: LuaSegmentedUnit — The segmented unit that was created.clone_source?: LuaSegmentedUnit — If the new segmented unit was cloned, the segmented unit from which the new unit was cloned.name: defines.events — Identifier of the eventtick: uint32 — Tick the event was generated.