Traits is now data-driven. Actor.cs is now SMALL. (win)

- FieldLoader can now handle arrays. This might be useful for Prerequisites, Owner fields.

OpenRa.Game/GameRules/UnitInfo.cs

@@ -19,7 +19,9 @@ namespace OpenRa.Game.GameRules
 		}
 
 		public readonly string Name;
+
 		public readonly string Description = "";
+		public readonly string[] Traits;
 
 		public readonly int Ammo = -1;
 		public readonly ArmorType Armor = ArmorType.none;