Allow the targeting of water tiles by default. This still doesn't allow targeting of underwater, which is they way it should be. Now ground based units will be allowed to force-attack water tiles.

OpenRA.Game/GameRules/WeaponInfo.cs

@@ -91,7 +91,7 @@ namespace OpenRA.GameRules
 		public readonly int Burst = 1;
 		public readonly bool Charges = false;
 		public readonly bool Underwater = false;
-		public readonly string[] ValidTargets = { "Ground" };
+		public readonly string[] ValidTargets = { "Ground", "Water" };
 		public readonly int BurstDelay = 5;
 		public readonly float MinRange = 0;