Organize src/game into sub-folders: arena, combat, fighter, and match

src/game/combat/arenaFinalCombatEffects.js

@@ -0,0 +1,15 @@
+export function easeOutCubic(progress) {
+  return 1 - (1 - progress) ** 3;
+}
+
+export function easeInOutCubic(progress) {
+  if (progress < 0.5) {
+    return 4 * progress ** 3;
+  }
+
+  return 1 - ((-2 * progress + 2) ** 3) / 2;
+}
+
+export function arcadePhysicsTimeScale(sceneTimeScale) {
+  return 1 / Math.max(sceneTimeScale, Number.EPSILON);
+}