Homing projectiles previously behaved like expanding circles, where the projectile was drawn
at the closest point on the circle to the target. Which meant that if the target was fast,
moving at right angles to the direction of the projectile, the projectile would move fast,
too (and would not be travelling in the direction it was facing).
Homing projectiles now go at a constant speed towards the target, using target prediction.
To test the target prediction, set the projectile speed to something close to 700 (same as a
VTOL), and try to get the VTOL to escape.
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