Changed threadengine to delete threads after Joining them, so the whole thread exists when being joined and so its safe to call non-threadsafe functions in the destructor

src/threadengine.cpp

@@ -12,7 +12,6 @@ Thread::Thread() : Exit(false)
  */
 Thread::~Thread()
 {
-	Join();
 }
 
 /** Sets the exit state as true informing the thread we want it to shut down