Various improvements

Game/Assets/Scripts/Utils/Task.cs

@@ -66,5 +66,26 @@ namespace TransportGame.Utils
             if (Success.HasValue && !Success.Value)
                 throw new Exception("Task failed", thrownException);
         }
+
+        public static IEnumerable InParallel(params IEnumerable[] funcs)
+        {
+            // Obtain iterators
+            var iterators = funcs.Select(enumerable => enumerable.GetEnumerator()).ToArray();
+
+            // Execute a slice of each
+            bool stop;
+            do
+            {
+                stop = true;
+
+                foreach (var it in iterators)
+                    if (it.MoveNext())
+                    {
+                        yield return it.Current;
+                        stop = false;
+                    }
+
+            } while (!stop);
+        }
     }
 }