Notification that the map's time left has changed via a change in the time limit or a change in the game rules (such as mp_restartgame). This is useful for plugins trying to create timers based on the time left in the map.
Calling ExtendMapTimeLimit() from here, without proper precaution, will cause infinite recursion.
If the operation is not supported, this will never be called.
If the server has not yet processed any frames (i.e. no players have joined the map yet), then this will be called once the server begins ticking, even if there is no time limit set.