Improvement on slingers

1 Hypaspists now have 3 light javelins per soldier instead of 2 heavy javelins.
2 Sarmatian lancers now have a higher charge bonus as an advantage of the Kontos over the Xyston used by other lancers.
3 Early Roman troops cannot use Defensive Testudo; they are learning how to counter cavalry charges step by step.
4 Parthian foot archers and horse archers now have 100 men per unit as an advantage of the faction.
5 Athens and Syracuse can now replace Hoplite and Light Hoplite with later versions using Thureos.