Added initial Melody Playback Ability

Now, controlled via MQTT a Playback of a melody can Start, Stop, Pause 
etc. 

Settings like speed, total duration, pauses etc can be set.

build/sketch/Timers.hpp

@@ -0,0 +1,28 @@
+#line 1 "C:\\Users\\espi_\\Documents\\Arduino\\vesper\\Timers.hpp"
+#pragma once
+
+extern volatile uint64_t startTime;
+extern melody_attributes melody;
+extern volatile bool playing; 
+
+void durationTimer(void *param);
+
+
+void durationTimer(void *param){
+	
+	// SETUP TASK 
+
+	for (;;){
+		
+		if (playing){
+			uint64_t now = millis();
+			uint64_t timeToStop = startTime + melody.duration;
+			if (now > timeToStop) {
+				playing = false;
+				Serial.println("Time Limit Reached. Stopping !");
+			}
+		}
+	}
+
+	
+}