ENH: liveview remote protocols with agora

Change-Id: Id86aa4bfa5f5e09675a6fe627668c63d20c7d1bf
Jira: none
(cherry picked from commit 46eba0048b73f1741b4b7b57f788830c08a8d7f1)

src/slic3r/Utils/NetworkAgent.hpp

@@ -226,6 +226,7 @@ public:
 
     int get_mw_user_preference(std::function<void(std::string)> callback);
     int get_mw_user_4ulist(int seed, int limit, std::function<void(std::string)> callback);
+    void *get_network_agent() { return network_agent; }
 
 private:
     bool enable_track = false;