Added Effect::start() and Effect::stop() to allow effects to reserve memory on start and free it afterwards.

src/effect_cycle.cpp

@@ -6,10 +6,21 @@ void CycleEffect::changeEffect() {
     int new_id = random8(cycle_effects->size());
     new_effect = cycle_effects->get(new_id);
   } while (&new_effect == &effect);
+  if (effect) effect->stop();
   effect = new_effect;
+  effect->start();
   effectSince = millis();
 }
 
+void CycleEffect::start() {
+    if (!effect) changeEffect();
+    else effect->start();
+}
+
+void CycleEffect::stop() {
+    if (effect) effect->stop();
+}
+
 boolean CycleEffect::can_be_shown_with_clock() {
   return effect->can_be_shown_with_clock();
 };