Vehicle crashing tweaks

[Doubleumc]

About the pull request

Corrects a few math issues and loosens tolerances so vehicle-crash-interior-flinging can actually happen now.

move_momentum can be positive for forward or negative for backward, so Floor(move_momentum/2) made forward crashes less intense and backward crashes more intense. Corrected to trunc(move_momentum/2), which rounds towards zero consistently.

The maximum value for move_momentum, fittingly named move_max_momentum, is 2 for the APC and 3 for the tank. Because its divided by 2 and then floored, the max momentum actually fed to the interior_crash_effect() proc was 1* (3/2 = 1.5, floor(1.5) = 1). interior_crash_effect() has an early return for if(abs(move_momentum) <= 1). Corrected to if(abs(move_momentum) < 1) so values of 1 still trigger the crash.

*except the tank moving backwards, (-3/2 = -1.5, floor(-1.5) = -2)

Correctly uses the magnitude of move_momentum in places where a negative number would cause inconsistent results, like fling_distance and camera shake strength.

Explain why it's good for the game

The code was there, implemented, called, but never actually fulfilled its own conditions -- except for the tank driving backwards at full speed, which can't be the only intended use.

If crashing wasn't desired, it would be better to remove it completely rather than leaving it in its bugged state.

Testing Photographs and Procedure

Boots without issue. Crashing visual and fling effects now work for both forward and backward collisions.

Changelog

🆑
fix: vehicle crashes more consistently fling loose contents
/:cl:

[AndroBetel]

will test merge for some time and then probably merge