Make the ICrushable interface a bit more sane, plus correct defaults for infantry

OpenRa.Game/Game.cs

@@ -243,9 +243,7 @@ namespace OpenRa.Game
 		{
 			return a != null &&
 				a.traits.WithInterface<ICrushable>()
-				.Any(c => c.CrushableBy(umt) &&
-					((c.IsCrushableByEnemy() && a.Owner != Game.LocalPlayer) ||
-					(c.IsCrushableByFriend() && a.Owner == Game.LocalPlayer)));
+				.Any(c => c.IsCrushableBy(umt, a.Owner));
 		}
 		
 		public static bool IsWater(int2 a)

OpenRa.Game/Traits/Infantry.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
+using OpenRa.Game.GameRules;
 
 namespace OpenRa.Game.Traits
 {
@@ -13,24 +13,15 @@ namespace OpenRa.Game.Traits
 			this.self = self;
 		}
 
-		public bool IsCrushableByFriend()
-		{
-			// HACK: should be false
-			return true;
-		}
-		public bool IsCrushableByEnemy()
-		{
-			// HACK: should be based off crushable tag
-			return true;
-		}
-
 		public void OnCrush(Actor crusher)
 		{
 			self.InflictDamage(crusher, self.Health, Rules.WarheadInfo["Crush"]);
 		}
 
-		public bool CrushableBy(UnitMovementType umt)
+		public bool IsCrushableBy(UnitMovementType umt, Player player)
 		{
+			if (player == Game.LocalPlayer) return false;
+			if (!(self.Info as InfantryInfo).Crushable) return false;
 			switch (umt)
 			{
 				case UnitMovementType.Track: return true;

OpenRa.Game/Traits/TraitsInterfaces.cs

@@ -61,9 +61,7 @@ namespace OpenRa.Game.Traits
 	
 	interface ICrushable
 	{
-		bool IsCrushableByFriend();
-		bool IsCrushableByEnemy();
 		void OnCrush(Actor crusher);
-		bool CrushableBy(UnitMovementType umt);
+		bool IsCrushableBy(UnitMovementType umt, Player player);
 	}
 }