Notes about new event StateChange

(copied from lucera blog)

Note that if you reach a state for the first time the order of the events will be:

1. ExitState (last state)
2. StateChange
3. Begin (for which behaviors associated with current state that have not been yet initialized)
4. EnterState
5. ...

For this reason we are able to make some configuration changes in this event, because it will be before than Begin