Remove RearmBuildings from Aircraft and Minelayer

In favor of using Rearmable trait.

OpenRA.Mods.Cnc/Traits/Minelayer.cs

@@ -21,10 +21,9 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.Cnc.Traits
 {
-	public class MinelayerInfo : ITraitInfo
+	public class MinelayerInfo : ITraitInfo, Requires<RearmableInfo>
 	{
 		[ActorReference] public readonly string Mine = "minv";
-		[ActorReference] public readonly HashSet<string> RearmBuildings = new HashSet<string> { "fix" };
 
 		public readonly string AmmoPoolName = "primary";