Fixed design problem: Thread objects can now be created in any context.

Sender thread output queue is now limited.
Server thread now terminates correctly.
Now cloning packets when sending them to multiple recipients.
Fixed one thread issue - GameStart still needs to be made thread safe.

src/core/thread.h

@@ -72,13 +72,13 @@ private:
 
 	// Flag specifying whether the thread should be terminated.
 	mutable boost::timed_mutex m_shouldTerminateMutex;
-	mutable boost::timed_mutex::scoped_try_lock m_userReqTerminateLock;
+	mutable boost::shared_ptr<boost::timed_mutex::scoped_try_lock> m_userReqTerminateLock;
 
 	// The boost thread object.
 	boost::shared_ptr<boost::thread> m_threadObj;
 	mutable boost::mutex m_threadObjMutex;
 
-	boost::barrier m_threadStartBarrier;
+	mutable boost::shared_ptr<boost::barrier> m_threadStartBarrier;
 
 friend class ThreadStarter;
 };