AimPointTrait
constAimPointTrait:Trait<{active:boolean;x:number;y:number;z:number; }>
The point aimAt last turned a character toward, and whether she still aims
at it. While active, the step turns her to face it and her steer walks
her without turning her, and her body turns her legs toward the step.
Written on the character, so a room streams it to every page and the dump
shows it.