[gameplay-a24] Balance ranged infantry citizen soldiers
Buffs archers (+0.7 Pierce)
Nerfs slingers. (-0.3 Pierce,-0.1 Crush,+0.5 Spread)
Differential Revision: https://code.wildfiregames.com/D2612
Patch by: ValihrAnt
Reviewed by: elexis
Comments by: badosu, Feldfeld