Reorganize solution structure.

Source/MQTTnet/Server/IMqttServerOptions.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace MQTTnet.Server
+{
+    public interface IMqttServerOptions
+    {
+        bool EnablePersistentSessions { get; }
+
+        int MaxPendingMessagesPerClient { get; }
+        MqttPendingMessagesOverflowStrategy PendingMessagesOverflowStrategy { get; }
+
+        TimeSpan DefaultCommunicationTimeout { get; }
+
+        Action<MqttConnectionValidatorContext> ConnectionValidator { get; }
+        Action<MqttSubscriptionInterceptorContext> SubscriptionInterceptor { get; }
+        Action<MqttApplicationMessageInterceptorContext> ApplicationMessageInterceptor { get; }
+        Action<MqttClientMessageQueueInterceptorContext> ClientMessageQueueInterceptor { get; set; }
+
+        MqttServerTcpEndpointOptions DefaultEndpointOptions { get; }
+        MqttServerTlsTcpEndpointOptions TlsEndpointOptions { get; }
+
+        IMqttServerStorage Storage { get; }
+    }
+}