UNIQUE_ID_OFFSET [int]:
{@link Target}s and {@link TargetPedestrian}s share the same address space for ids! This can cause conflicts when the target potential is retrieved in "PotentialFieldTarget.getPotential()". "PotentialFieldTarget" stores potentials in a map. Therefore, use a fixed offset to discriminate {@link Target}s and {@link TargetPedestrian}s.