initial spectator + recording implementation

src/Server.hh

@@ -31,6 +31,7 @@ public:
       GameVersion version, ServerBehavior initial_state);
 
   std::shared_ptr<Client> get_client() const;
+  std::shared_ptr<struct event_base> get_base() const;
 
 private:
   std::shared_ptr<struct event_base> base;