Called when a cutscene is playing, each time it reaches a waypoint in that cutscene.
This refers to an index in the table previously passed to set_controller which started the cutscene.
player_index: uint32 — The player index of the player viewing the cutscene.waypoint_index: uint32 — The index of the waypoint we just completed.name: defines.events — Identifier of the eventtick: uint32 — Tick the event was generated.