Weapon FR: Type 5 beam linger/hesitation

Isolated and salvaged from #2412 now that most of that request is effectively implemented

I would like to be able to define separate linger/hesitation periods at both the beginning and end of a type 5 beam cycle where the beam is active and positioned at the start or end position of the beam cycle, but is not moving(unless the beam has a continuous rotation value, in which case that would be obeyed.