Move weapon/turret definitions out of AttackBase.

Weapons are now defined with the Armament trait
and turret parameters live in Turreted.
This has the side effect of allowing any number
and distribution of weapons and turrets.

OpenRA.Mods.RA/Attack/AttackFrontal.cs

@@ -42,10 +42,10 @@ namespace OpenRA.Mods.RA
 
 		public override Activity GetAttackActivity(Actor self, Target newTarget, bool allowMove)
 		{
-			var weapon = ChooseWeaponForTarget(newTarget);
-			if( weapon == null )
+			var weapon = ChooseArmamentForTarget(newTarget);
+			if (weapon == null)
 				return null;
-			return new Activities.Attack(newTarget, Math.Max(0, (int)weapon.Info.Range), allowMove);
+			return new Activities.Attack(newTarget, Math.Max(0, (int)weapon.Weapon.Range), allowMove);
 		}
 	}
 }