Abort main flow if we can't connect after STEAM3_TIMEOUT seconds

DepotDownloader/ContentDownloader.cs

@@ -293,7 +293,7 @@ namespace DepotDownloader
             }
         }
 
-        public static void InitializeSteam3(string username, string password)
+        public static bool InitializeSteam3(string username, string password)
         {
             steam3 = new Steam3Session(
                 new SteamUser.LogOnDetails()
@@ -308,10 +308,11 @@ namespace DepotDownloader
             if (!steam3Credentials.IsValid)
             {
                 Console.WriteLine("Unable to get steam3 credentials.");
-                return;
+                return false;
             }
 
             cdnPool = new CDNClientPool(steam3);
+            return true;
         }
 
         public static void ShutdownSteam3()

DepotDownloader/Program.cs

@@ -108,9 +108,11 @@ namespace DepotDownloader
                 Console.WriteLine("No username given. Using anonymous account with dedicated server subscription.");
             }
 
-            ContentDownloader.InitializeSteam3(username, password);
-            ContentDownloader.DownloadApp(appId, depotId, branch, forceDepot);
-            ContentDownloader.ShutdownSteam3();
+            if (ContentDownloader.InitializeSteam3(username, password))
+            {
+                ContentDownloader.DownloadApp(appId, depotId, branch, forceDepot);
+                ContentDownloader.ShutdownSteam3();
+            }
         }
 
         static int IndexOfParam( string[] args, string param )