Hacky stuff to allow Chinooks to move over stuff

while still blocking each other

OpenRA.Mods.Common/Traits/Mobile.cs

@@ -78,6 +78,12 @@ public class MobileInfo : ConditionalTraitInfo, IMoveInfo, IPositionableInfo, IF
 		[Desc("Occupy space? Units such as Mob spawners doesn't occupy space, letting others to enter.")]
 		public readonly bool OccupySpace = true;
 
+		[Desc("If this value is not null, these actors can't block me.")]
+		public readonly string[] NonBlockerActors = null;
+
+		[Desc("If this value is not null, only these actors can block me.")]
+		public readonly string[] BlockerActors = null;
+
 		[Desc("Can the actor be ordered to move in to shroud?")]
 		public readonly bool MoveIntoShroud = true;
 
@@ -324,6 +330,14 @@ bool IsBlockedBy(Actor self, Actor otherActor, Actor ignoreActor, CellConditions
 				IsMovingInMyDirection(self, otherActor))
 				return false;
 
+			if (BlockerActors != null)
+				if (!BlockerActors.Contains(otherActor.Info.Name))
+					return false;
+
+			if (NonBlockerActors != null)
+				if (NonBlockerActors.Contains(otherActor.Info.Name))
+					return false;
+
 			// If there is a temporary blocker in our path, but we can remove it, we are not blocked.
 			var temporaryBlocker = otherActor.TraitOrDefault<ITemporaryBlocker>();
 			if (temporaryBlocker != null && temporaryBlocker.CanRemoveBlockage(otherActor, self))