code: public Timer start(BlockPos pos, String animation, Timer timer)
  	{
  		if (!isAnimating(pos, animation))
  			addTimer(pos, animation, timer);
  		return getTimer(pos, animation);
  	}
docs: Start the animation with the specified {@link Timer}.<br>
  No effect if the animation is already running.
  
  @param pos the pos
  @param animation the animation
  @param timer the timer
  @return the timer