Avoid initialization of graphical elements for a server.

Avoid allocating memory and resources for graphical elements that will never be drawn when starting a dedicated server. This reduces the server memory footprint by approx 17 MiB.

OpenRA.Game/Game.cs

@@ -300,10 +300,11 @@ namespace OpenRA
 			Sound.StopVideo();
 			Sound.Initialize();
 
-			ModData = new ModData(mod, true);
-
-			Renderer.InitializeFonts(ModData.Manifest);
+			ModData = new ModData(mod, !Settings.Server.Dedicated);
 			ModData.InitializeLoaders();
+			if (!Settings.Server.Dedicated)
+				Renderer.InitializeFonts(ModData.Manifest);
+
 			using (new PerfTimer("LoadMaps"))
 				ModData.MapCache.LoadMaps();