Added new unit - Sabre Infantry
Sabre Infantry are melee infantry available equiped with sabres. They provide a frontline melee unit to a commander unwilling to invest in more 'traditional' units, being recruited from the Modern Military building tree.

Balancing
Mounted Police - Multiplayer cost reduced to 500, campaign cost reduced to 450, upkeep reduced to 70
Revolver Infantry - Upkeep reduced to 110