- decouple the Sevana libraries; some improvements for statistics

src/engine/agent/Agent_Impl.h

@@ -13,18 +13,8 @@
 #include "Agent_AudioManager.h"
 #include <mutex>
 #include <condition_variable>
-#if defined(USE_AQUA_LIBRARY)
-# include "aqua++.h"
-#endif
-
-#if defined(USE_PVQA_LIBRARY)
-# include "pvqa++.h"
-#endif
 
 class AgentImpl: public UserAgent
-#if defined(USE_AQUA_LIBRARY)
-    , public MT::Stream::MediaObserver
-#endif
 {
 protected:
   std::recursive_mutex mAgentMutex;