Looks in the sequence data list to find the time at which the first occurrence of a specified event name is called.
get_time_of_first_event(sequence_data, event_type)
The sequence data list (i.e. `sequence0_T00X.json` parsed to a `list`).
A string containing the name of the event type. Should be one of `"Wait"`, `"Event Call"`, `"Animate Behaviour"`, `"Move Towards`, `"Rotate Towards"` `"Head Look"`.
A numeric value of the time (in Unity time, seconds since start-up) of the event. NA if none found.