This way the results of committing the debriefing can't alter the view
of the debriefing. It looks like it was probably that case that
debriefing information displays (but not the committed results) would be
incorrect after a base capture because the results might be shown after
the results were committed.
Maybe fixes https://github.com/Khopa/dcs_liberation/issues/513
Apparently we were already getting this info because it's a unit like
any other according to the event system, so if runways were actually
sufficiently damaged we'd emit a ton of exceptions.
This doesn't do anything yet, but tracks the damage state. Will add the
ability to repair them next, and then finally make the damage render the
runway inoperable.
Generated units are added to this during mission generation so we can
map destroyed units back to the data that generated them. Currently only
implemented for aircraft as a proof of concept.
