SnappyComebacks a53a648a63 Add plannable tankers.
This Pull Request lets users plan Tanker flights.

Features:

- Introduction of `Refueling` flight type.
- Tankers can be purchased at airbases and carriers.
- Tankers get planned by AI.
- Tankers are planned from airbases and at aircraft carriers.
- Tankers aim to be at high, fast, and 70 miles from the nearest threat.
  (A10s won't be able to tank)
- Tankers racetrack orbit for one hour.
- Optional Tickbox to enable legacy tankers.
- S-3B Tanker added to factions.
- KC-130 MPRS added to factions.
- Kneeboard shows planned tankers, their tacans, and radios.

Limitations:

- AI doesn't know whether to plan probe and drogue or boom refueling
  tankers.
- User can't choose tanker speed.  Heavily loaded aircraft may have
  trouble.
- User can't choose tanker altitude.  A-10s will not make it to high
  altitude.

Problems:

- Tanker callsigns do not increment, see attached image.  (Investigated:
  Need to use `FlyingType.callsign_dict`, instead of just
  `FlyingType.callsign`.  This seems like it might be significant work
  to do.).
- Having a flight of two or more tankers only spawns one tanker.
- Let me know if you have a solution, or feel free to commit one.

https://user-images.githubusercontent.com/74509817/120909602-d7bc3680-c633-11eb-80d7-eccd4e095770.png
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