Some memory leaks fixed.

include/effect_clock.h

@@ -10,6 +10,7 @@ private:
     Window* window = new Window(0, LED_HEIGHT - 6, LED_WIDTH, 6);
 
 public:
+    ~ClockEffect();
     void loop();
     void loop(boolean invert, CRGB fg_color, CRGB bg_color);
 };

include/effect_snake.h

@@ -17,6 +17,7 @@ private:
 	bool is_direction_okay(uint8_t direction);
 public:
 	SnakeEffect();
+	~SnakeEffect();
 	void loop();
 	boolean valid_position(Coords c);
 	Coords update_position(Coords c, uint8_t direction);