Improvements & additions for reinforcement aircraft spawn logic

[Starkku]

• Adds support for SpawnDistanceFromTarget & SpawnHeight to paradrop planes (with and without Ares)
• Introduces SpawnFromEdge & RetreatToEdge to control which edge of the map planes spawn from / retreat to.
• Planes now spawn facing their target instead of always north.

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Note: SpawnDistanceFromTarget/SpawnHeight for spy planes and airstrike aircraft was already implemented prior to this PR, full documentation is included because the wording/formatting was updated.

Reinforcement aircraft spawn settings

• A number of new settings are available for AircraftTypes spawned from (Elite)AirstrikeTeamType or Type=SpyPlane/Paradrop/AmerParadrop superweapons.
  • SpawnFromEdge and RetreatToEdge can be used to customize the edge of map from where the aircraft spawns and where it retreats to, respectively. Defaults to the owner's edge of the map which is determined based on base location and other factors.
  • SpawnDistanceFromTarget can be used to set fixed spawn distance from target instead of at edge of map. The approach direction is still determined by the edge where it would've otherwise spawned. Negative values will invert the direction.
  • SpawnHeight can be used to override the initial height of the aircraft, which defaults to FlightLevel, or if not set then [General] -> FlightLevel.
  • Additionally, these aircraft now spawn facing the target's direction instead of always facing north.

In rulesmd.ini:

[SOMEAIRCRAFT]            ; AircraftType
SpawnFromEdge=owner       ; Edge type enumeration (owner|closest|random)
RetreatToEdge=owner       ; Edge type enumeration (owner|closest|random)
SpawnDistanceFromTarget=  ; floating point value, distance in cells
SpawnHeight=              ; integer, height in leptons

[github-actions]

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