fixedStep method
Runs one fixed step.
Implementation
void fixedStep(double fixedDt) {
app.world.resources.get<FixedTime>()
..delta = fixedDt
..tick += 1;
app.runSchedule(Schedules.fixedPrePhysics);
app.world.resources.tryGet<RemoveAfterTracker>()?.tick(fixedDt);
onCommandBoundary?.call();
}