Implement a new module command that is called right before cosing the virtual machine to allow modules to release resources manually.

Should fix a possible crash in the IRC plugin which was caused by the Session destructor to be called recursively when cleaned automatically by the VM.

modules/irc/Session.cpp

@@ -202,7 +202,9 @@ void Session::Destroy()
 {
     // Make sure there's even a session to release
     if (!m_Session)
+	{
         return;
+	}
     // Disconnect the session
     Disconnect();
     // Break the association with this instance (paranoia)