Outbound message re architecture (#116)

* Removing const keyword from send function definition in comm_session class.

* Rearchitecture outgoing messages.

* Removed concurrentqueue.h file out of the project.

* Updated ReadMe file.

* Minor comment reformattings.

* Readme update with concurrent queue github link.

* Removed should_stop_messaging_threads variable.

* Updated ReadMe file

* Updated and Changed the formatting of the Blake3 build script in ReadMe.

* Resolved review comment.

Co-authored-by: Savinda Senevirathne <savindadilsara@gmail.com>

src/comm/comm_server.cpp

@@ -157,6 +157,10 @@ namespace comm
                     {
                         std::scoped_lock<std::mutex> lock(sessions_mutex);
                         const auto [itr, success] = sessions.try_emplace(client_fd, std::move(session));
+
+                        // Thread is seperately started after the moving operation to overcome the difficulty
+                        // in accessing class member variables inside the thread.
+                        // Class member variables gives unacceptable values if the thread starts before the move operation.
                         itr->second.start_messaging_threads();
                     }
                 }
@@ -209,6 +213,9 @@ namespace comm
                     {
                         std::scoped_lock<std::mutex> lock(sessions_mutex);
                         const auto [itr, success] = sessions.try_emplace(client.read_fd, std::move(session));
+                        // Thread is seperately started after the moving operation to overcome the difficulty
+                        // in accessing class member variables inside the thread.
+                        // Class member variables gives unacceptable values if the thread starts before the move operation.
                         itr->second.start_messaging_threads();
                     }