Following a suggestion from @schnoodly and @kiloforce, have added a new button to Timer Controls which will restart the timer. This will restart both the animation and countdown as well as reset any end message or sound. If a player has closed their timer window, this button will also redisplay the timer for them. If pressed while the timer is paused it will restart the timer but remain paused until the GM presses "resume".
Following a suggestion from @kiloforce, have added a "Close after duration" option for new timers. Checking this option will cause the timer window to close for all users once the timer duration has passed. Any end sound or message will still be triggered before the window closes (though any end message will be only fleetingly visible). Further to this suggestion I have also updated the "close" button on the timer such that, should a user with GM role close their timer, it will close that same timer for all other users.
