Stage name: CargoTransfer
For each ship in Id order, do transfers to other ships (ship/foreign ship transfer orders, given through client interface or transfer command). If transfer fails, cargo is put back to original ship. Cargo transfers between ships of the same race are usually resolved client-side, and therefore already processed in phase 1. Cargo transfers using missions are resolved later.
This stage cannot be skipped (cargo transporters must be empty during rest of host run).
