Fix some compile warnings

OpenRA.Mods.RA/Minelayer.cs

@@ -125,7 +125,6 @@ namespace OpenRA.Mods.RA
 				if (!minelayer.IsInWorld)
 					return;
 
-				var ml = minelayer.Trait<Minelayer>();
 				var movement = minelayer.Trait<IMove>();
 				var minefield = GetMinefieldCells(minefieldStart, lastMousePos, minelayer.Info.Traits.Get<MinelayerInfo>().MinefieldDepth)
 					.Where(p => movement.CanEnterCell(p)).ToArray();

OpenRA.Mods.RA/Orders/PlaceBuildingOrderGenerator.cs

@@ -64,11 +64,11 @@ namespace OpenRA.Mods.RA.Orders
 		public void Tick( World world )
 		{
 			// Find the queue with the target actor
-			var queue = Producer.TraitsImplementing<ProductionQueue>()
-				.Where(p => p.CurrentItem() != null && 
-		                 	p.CurrentItem().Item == Building && 
-		                 	p.CurrentItem().RemainingTime == 0)
-				.FirstOrDefault();
+			//var queue = Producer.TraitsImplementing<ProductionQueue>()
+			//	.Where(p => p.CurrentItem() != null && 
+		    //             	p.CurrentItem().Item == Building && 
+		    //             	p.CurrentItem().RemainingTime == 0)
+			//	.FirstOrDefault();
 		}
 
 		public void RenderAfterWorld( World world ) {}

OpenRA.Mods.RA/Reservable.cs

@@ -13,17 +13,14 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
-	class ReservableInfo : ITraitInfo
-	{
-		public object Create(ActorInitializer init) { return new Reservable(init.self); }
-	}
+	class ReservableInfo : TraitInfo<Reservable> {}
 
 	public class Reservable : ITick
 	{
 		Actor reservedFor;
-		Actor self;
+		//Actor self;
 
-		public Reservable(Actor self) { this.self = self; }
+		//public Reservable(Actor self) { this.self = self; }
 
 		public void Tick(Actor self)
 		{

OpenRA.Mods.RA/TargetableAircraft.cs

@@ -17,7 +17,6 @@ namespace OpenRA.Mods.RA
 {
     public class TargetableAircraftInfo : TargetableInfo
     {
-        public readonly string[] TargetTypes = { };
         public readonly string[] GroundedTargetTypes = { };
         public override object Create(ActorInitializer init) { return new TargetableAircraft(init.self, this); }
     }