[Feature Request] Event triggering skipped in subsequences and shots

Events in subscenes can be skipped if playback skips over the end of the subscene before evaluating the event. ECS allows for determinism fences which can fix this issue.

1. Create a sequence
2. Add a subscene track to the sequence
3. In the subscene add an event that prints "Hello" near the end of the sequence
4. In the parent sequence scrub to before the event and play past the end

RESULT:

The event will fire inconsistently