To improve IADS design in campaigns, this differentiates required long
and medium range SAMs. SAMs that must be long range SAMs are defined by
SA-10 or Patriot launchers, while medium range SAMs are defined by SA-2,
SA-3, or Hawk launchers.
Long range SAMs positions will only be populated by long range SAMs
(Patriots and SA-10s), and not all factions have those available. Medium
range SAMs currently comprise all air defenses that are not long range
SAMs, so if the faction includes flak guns in their `sams` property then
flak guns may be spawned at medium range SAM locations.
Base defenses and random SAM locations continue to use either type of
SAM.
