Move many mods to Deprecated folder, fix spelling

BetterContentLoading/DownloadManager2/ConcurrentPriorityQueue.cs

@@ -0,0 +1,43 @@
+namespace NAK.BetterContentLoading;
+
+public class ConcurrentPriorityQueue<TElement, TPriority> where TPriority : IComparable<TPriority>
+{
+    private readonly object _lock = new();
+    private readonly SortedDictionary<TPriority, Queue<TElement>> _queues = new();
+
+    public void Enqueue(TElement item, TPriority priority)
+    {
+        lock (_lock)
+        {
+            if (!_queues.TryGetValue(priority, out var queue))
+            {
+                queue = new Queue<TElement>();
+                _queues[priority] = queue;
+            }
+            queue.Enqueue(item);
+        }
+    }
+
+    public bool TryDequeue(out TElement item, out TPriority priority)
+    {
+        lock (_lock)
+        {
+            if (_queues.Count == 0)
+            {
+                item = default;
+                priority = default;
+                return false;
+            }
+
+            var firstQueue = _queues.First();
+            priority = firstQueue.Key;
+            var queue = firstQueue.Value;
+            item = queue.Dequeue();
+
+            if (queue.Count == 0)
+                _queues.Remove(priority);
+
+            return true;
+        }
+    }
+}