Move signal index to method index conversion to Util.

Going to be needed by at least every user of the signal spy callbacks.
Properly map signal indexes to method indexes.

Also store them with an offset of 1, so we can also handle unknown ones
inside the 16 bits of the event field we have available for this.
Properly draw alive objects if we render beyond the current time.
Also update the view when auto-scrolling is paused.