Oops when stuck cargo snaps to new ship, plane or land unit

Oops when stuck cargo snaps to new ship, plane or land unit

When units somehow get stuck on a dead carrier, a new build reusing
the dead carrier's UID picks up its cargo.  The cargo gets teleported
to its new carrier when the carrier moves.

Oops when a ship, plane or land unit is created with cargo.  To
recover, destroy the cargo.