renamed Actor.unitInfo to "Info"; other minor changes

OpenRa.Game/Bullet.cs

@@ -138,13 +138,10 @@ namespace OpenRa.Game
 
 		float GetDamageToInflict(Actor target)
 		{
-			if( target.unitInfo == null ) // tree or other doodad
-				return 0;
-
 			/* todo: some things can't be damaged AT ALL by certain weapons! */
 			var distance = (target.CenterLocation - Dest).Length;
 			var rawDamage = Weapon.Damage * (float)Math.Exp(-distance / Warhead.Spread);
-			var multiplier = Warhead.EffectivenessAgainst(target.unitInfo.Armor);
+			var multiplier = Warhead.EffectivenessAgainst(target.Info.Armor);
 
 			return rawDamage * multiplier;
 		}