clean up LoadModAssemblies nonsense a bit

OpenRA.FileFormats/Exts.cs

@@ -20,6 +20,8 @@
 
 using System;
 using System.Collections.Generic;
+using System.Reflection;
+using System.Linq;
 
 namespace OpenRA
 {
@@ -35,5 +37,10 @@ namespace OpenRA
 			foreach( var ee in e )
 				fn( ee );
 		}
+
+		public static IEnumerable<string> GetNamespaces(this Assembly a)
+		{
+			return a.GetTypes().Select(t => t.Namespace).Distinct().Where(n => n != null);
+		}
 	}
 }

OpenRA.Game/Game.cs

@@ -71,11 +71,9 @@ namespace OpenRA
 		internal static void LoadModAssemblies(Manifest m)
 		{	
 			// All the core namespaces
-			var asms = new List<Pair<Assembly, string>> (typeof(Game).Assembly.GetTypes()
-			                                             .Select(a => a.Namespace)
-			                                             .Distinct()
-			                                             .Where(b => b != null)
-			                                             .Select(c => Pair.New(typeof(Game).Assembly, c)));
+			var asms = typeof(Game).Assembly.GetNamespaces()
+				.Select(c => Pair.New(typeof(Game).Assembly, c))
+				.ToList();
 
 			// Mod assemblies assumed to contain a single namespace
 			foreach (var a in m.Assemblies)