Mutex should be locked before IsConnected(), as IsConnected() accesses CSocketCreator which checks a vector (not thread safe), lock the mutex in the correct place.
* Fix multiple issues related to threading, such as not locking the mutex when using thread-unsafe members or methods.
* Netconsole now logs its output to a file on the disk.
* Properly handle close events, to allow netconsole to shutdown properly, so stuff like log buffers could flush properly. Input is now ran in a separate thread so main thread could check if we need to shutdown, and do so if needed. This was needed as previously input was ran in the main thread and the issue is that its blocking until an input is given.
