add event system and use it to propagate to print traces

src/lib/eventsystem/event/TracePrintRequestedEvent.h

@@ -0,0 +1,10 @@
+#ifndef TRACE_PRINT_REQUESTED_EVENT_H
+#define TRACE_PRINT_REQUESTED_EVENT_H
+
+#include "Event.h"
+
+class TracePrintRequestedEvent : public Event
+{
+};
+
+#endif   // TRACE_PRINT_REQUESTED_EVENT_H