ConstCountdown timer displayed on screen. Returns a promise that resolves when countdown reaches 0.
Optionalx: numberOptionaly: numberFreeze the scene for a duration (hit-stop / hit-lag effect). Uses setTimeout (real time) instead of scene.time.delayedCall because the latter respects timeScale and would never fire when timeScale is 0.
Flash the screen a color (damage, power-up, etc.)
Wait for a duration (ms) — use in async scene methods.
Common scene utility functions.