switch to using own event system

src/balancing/InspectWindow.h

@@ -15,13 +15,15 @@
 #include "EntitySelectedEvent.h"
 #include "EventHandler.h"
 #include "GameConfig.h"
+#include "GameSpeedChangedEvent.h"
 #include "VisualsConfig.h"
 
 class ArenaView;
 class ShipStatsPanel;
 
 class InspectWindow : public QWidget,
-                      public EventHandler<EntitySelectedEvent>
+                      public CombinedEventHandler<EntitySelectedEvent,
+                                                  GameSpeedChangedEvent>
 {
     Q_OBJECT
 
@@ -31,19 +33,16 @@ public:
                   const std::string& arenaName, QWidget* parent = nullptr);
     ~InspectWindow() override;
 
-signals:
-    void closed();
-
 protected:
     void closeEvent(QCloseEvent* event) override;
     void keyPressEvent(QKeyEvent* event) override;
 
 private:
     void handleEvent(std::shared_ptr<const EntitySelectedEvent> event) override;
+    void handleEvent(std::shared_ptr<const GameSpeedChangedEvent> event) override;
 
 private slots:
     void onSpeedButton(int index);
-    void onSpeedChanged(double multiplier);
     void pollStatus();
 
 private: