add event system and use it to propagate to print traces

src/ui/GameWorldView.cpp

@@ -20,6 +20,7 @@
 #include "BeltSystem.h"
 #include "Building.h"
 #include "BuildingSystem.h"
+#include "EventManager.h"
 #include "FacingComponent.h"
 #include "FactionComponent.h"
 #include "HealthComponent.h"
@@ -32,6 +33,7 @@
 #include "StationBodyComponent.h"
 #include "SurfaceMask.h"
 #include "Tick.h"
+#include "TracePrintRequestedEvent.h"
 
 namespace
 {
@@ -1132,9 +1134,12 @@ void GameWorldView::keyPressEvent(QKeyEvent* event)
     case Qt::Key_Backspace:
         toggleDemolishMode();
         break;
-    case Qt::Key_M:
-        m_debugDraw = !m_debugDraw;
-        break;
+	case Qt::Key_M:
+		m_debugDraw = !m_debugDraw;
+		break;
+	case Qt::Key_L:
+		EventManager::getInstance()->addEvent(std::make_shared<TracePrintRequestedEvent>());
+		break;
     default:
         QOpenGLWidget::keyPressEvent(event);
         break;