Fix: Optimize drop location and spacing of USA Paradrops

[xezon]

This change optimizes the drop location and spacing of the USA Paradrops. The soldiers now fall into a line and no longer charge towards to same position. The spacing is tightened consistently and they fall as close to the drop center as possible.

Optimized for fix TheAssemblyArmada/Thyme#752.

Original

Paradrop 1 spacing is not tight. Soldier fall too far behind.

generals.2023-07-01.17-19-12-33.mp4

Paradrop 3 is poorly executed. Depending on drop angle, planes will return a second time.

generals.2023-07-01.17-19-35-26.mp4

Patched (+Thyme 752)

Paradrop 1 is nice.

game.2023-07-01.17-07-31-31.mp4

Paradrop 3 is nice.

game.2023-07-01.17-08-04-79.mp4

[commy2]

I notice that each plane drops 6 rangers, then 4 mds next to each other. Maybe we can mix it up a bit?

Instead of

Payload = AmericaInfantryRanger 6
Payload = AmericaInfantryMissileDefender 4

have

Payload = AmericaInfantryRanger 3
Payload = AmericaInfantryMissileDefender 2
Payload = AmericaInfantryRanger 3
Payload = AmericaInfantryMissileDefender 2