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
Not converting all at once so I can prove the concept. After that we'll
want to cover all the cases where an int distance or speed is a part of
the save game (I've done one of them here with `Flight.alt`) so further
cleanups don't break save compat.
https://github.com/Khopa/dcs_liberation/issues/558
* Introduce a real type.
* Rewrite _transform_point to make use of Point.
* Add shift modifier for large (10 pixel) adjustements to reference
points. Unmodified behavior is now single pixel.
* Use WASD for moving the second point (shift modified numpad keys don't
seem to work).
* Add a debug option to draw transformed reference points to check for
errors. If they don't overlap, something is wrong.
* Cleaned up all the existing reference points. Caucasus in particular
is now *much* better.
As an added bonus, the cleanup for carrier movement projection now also
shows an invalid destination when the destination is on land.
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
AI aircraft purchase decisions are now driven by the missions that the
flight planner was unable to fulfill. This way we're buying the aircraft
we actually need instead of buying them at random, in the locations we
need them, in the order they're needed.
There's a bit more that could be improved here:
* Unused aircraft could be ferried to where they would be more useful.
* Partial squadrons could be completed rather than buying a whole flight
at a time.
* Aircraft could be ranked by their usefulness so we're not buying so
many Hueys when a Hornet would do better.
* Purchase a buffer of CAP capable aircraft in case too many are shot
down and they are not available next turn.
https://github.com/Khopa/dcs_liberation/issues/361
