Creates threat zones around airfields and non-trivial air defenses (it's
not worth dodging anything with a threat range under 3nm). These threat
zones can be used to aid mission planning and waypoint placement.
https://github.com/Khopa/dcs_liberation/issues/292
Ensures frontline stays outside of exclusion zones by adjusting its
position and width
Adds a DisplayOption for viewing the frontline vector on the map