Currently:
- units/cart_cavalry_swordsman_gaul_* templates use units/gauls/cavalry_swordsman_* actors
- units/cart_infantry_swordsman_gaul_* templates use units/gauls/infantry_swordsman_* actors
- units/cart_infantry_javelinist_iber_* templates use units/iberians/infantry_javelinist_* actors
- units/cart_infantry_slinger_iber_* templates use units/iberians/infantry_slinger_* actors
However, the units/cart_cavalry_swordsman_iber_* templates use units/carthaginians/cavalry_swordsman_* actors. This patch moves those to the iberians/ folder for consistency and to avoid potential, future duplication.