allow to inspect balancing arena

src/balancing/ArenaWidget.h

@@ -18,9 +18,11 @@ public:
 
     void updateStatus(const ArenaStatus& status);
     void startSimulation();
+    void resetToGrey();
 
 signals:
     void startRequested();
+    void inspectRequested();
 
 private:
     void buildLayout(const std::string& arenaName);
@@ -30,6 +32,7 @@ private:
     QLabel* m_team2Header;
     QLabel* m_team1Content;
     QLabel* m_team2Content;
+    QPushButton* m_inspectButton;
     QPushButton* m_startButton;
     bool m_running;
     bool m_wasFinished;