Add the specified time to the current time of the targeted timeline.
- timeline : The targeted timeline. If empty targets the targeted
entity's Default timeline, else targets the timeline with the
specified name ; there is a Default timeline with each entity and
one for each event under the targeted entity.
- timeline_play : If checked (the default) the targeted timeline
is played after the time jump. This is equivalent to adding an
Action/TimelinePlay beside the action.