balancing arenas can be started individually

src/balancing/BalancingWindow.h

@@ -4,10 +4,11 @@
 #include <thread>
 #include <vector>
 
+#include <QPushButton>
 #include <QTimer>
 #include <QWidget>
 
-#include "ArenaButton.h"
+#include "ArenaWidget.h"
 #include "ArenaSimulation.h"
 #include "BalancingConfig.h"
 #include "GameConfig.h"
@@ -24,15 +25,20 @@ public:
 
 private slots:
     void pollStatuses();
+    void startAll();
+    void startArena(int index);
 
 private:
+    void updateStartAllButton();
+
     struct ArenaEntry
     {
         std::unique_ptr<ArenaSimulation> simulation;
         std::thread worker;
-        ArenaButton* button;
+        ArenaWidget* widget;
     };
 
     std::vector<ArenaEntry> m_arenas;
+    QPushButton* m_startAllButton;
     QTimer* m_pollTimer;
 };