Draft: Implement event priority on same tick

Draft of a potential improvement to the Maneuver and Event nodes, which should enable events to be stopped on the same tick that an override event starts.

This moves the start triggers to the maneuver level so that they are all checked before running event actions. Events do not have the start trigger as a child node, but still check the status.

It is still a proof-of-concept to look at other ways to organize the nodes.