advanceTime method
Implementation
@override
void advanceTime(num deltaTime) {
_currentTime += deltaTime;
_enterFrameEvent.passedTime = deltaTime;
_enterFrameEvent.dispatch();
_juggler.advanceTime(deltaTime);
_stages.forEach((s) => s.juggler.advanceTime(deltaTime));
_stages.forEach((s) => s.materialize(_currentTime, deltaTime));
_exitFrameEvent.dispatch();
}