Added tests. Start them by sending a message to MQTT_TOPIC/run_tests. First test will test all effects for memory leaks.

include/effects.h

@@ -11,7 +11,7 @@ extern uint8_t cycle_effects_count;
 extern Effect* current_effect;
 extern ClockEffect effect_clock;
 
-Effect* string_to_effect(String s);
+Effect* select_effect(uint32_t c);
 bool change_current_effect(String s);
 void setup_effects();
 

include/tests.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace tests {
+	void run();
+	void test_effects_for_memory_leaks();
+}