Some memory leaks fixed.

src/effect_snake.cpp

@@ -6,6 +6,10 @@ SnakeEffect::SnakeEffect() {
 	this->window = new Window(0, 0, LED_WIDTH, LED_HEIGHT-6);
 }
 
+SnakeEffect::~SnakeEffect() {
+	delete window;
+}
+
 void SnakeEffect::loop() {
 	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();