Effect#loop now gets the time since the last run of the loop in ms. This enables

the effects to show animations that stay fluid independent of the current frame rate.

src/effect_snake.cpp

@@ -10,7 +10,7 @@ SnakeEffect::~SnakeEffect() {
 	delete window;
 }
 
-void SnakeEffect::loop() {
+void SnakeEffect::loop(uint16_t ms) {
 	if (run++ % EFFECT_SNAKE_SLOWDOWN == 0) { // Change the coordinates only on every n-th run.
 		if (random8(EFFECT_SNAKE_DIRECTION_CHANGE)==0 || is_turn_needed()) turn_random();