Cleaned up request acks. Added internal service bus for internal messaging.

Bus/ServiceBusObservable.cs

@@ -0,0 +1,41 @@
+using System.Reactive;
+
+namespace TwitchChatTTS.Bus
+{
+    public class ServiceBusObservable : ObservableBase<ServiceBusData>
+    {
+        private readonly string _topic;
+        private readonly ServiceBusCentral _central;
+
+        public ServiceBusObservable(string topic, ServiceBusCentral central)
+        {
+            _topic = topic;
+            _central = central;
+        }
+
+        protected override IDisposable SubscribeCore(IObserver<ServiceBusData> observer)
+        {
+            _central.Add(_topic, observer);
+            return new ServiceBusUnsubscriber(_topic, _central, observer);
+        }
+
+        private sealed class ServiceBusUnsubscriber : IDisposable
+        {
+            private readonly string _topic;
+            private readonly ServiceBusCentral _central;
+            private readonly IObserver<ServiceBusData> _receiver;
+
+            public ServiceBusUnsubscriber(string topic, ServiceBusCentral central, IObserver<ServiceBusData> receiver)
+            {
+                _topic = topic;
+                _central = central;
+                _receiver = receiver;
+            }
+
+            public void Dispose()
+            {
+                _central.RemoveObserver(_topic, _receiver);
+            }
+        }
+    }
+}