allow to re-load the config for the balancing app via button

src/balancing/BalancingWindow.h

@@ -1,10 +1,12 @@
 #pragma once
 
 #include <memory>
+#include <string>
 #include <thread>
 #include <vector>
 
 #include <QPushButton>
+#include <QScrollArea>
 #include <QTimer>
 #include <QWidget>
 
@@ -19,17 +21,22 @@ class BalancingWindow : public QWidget
 
 public:
     BalancingWindow(const BalancingConfig& balancingConfig,
-                    const GameConfig& gameConfig,
+                    GameConfig gameConfig,
+                    const std::string& configDir,
+                    const std::string& balancingConfigPath,
                     QWidget* parent = nullptr);
     ~BalancingWindow() override;
 
 private slots:
     void pollStatuses();
+    void reloadConfig();
     void startAll();
     void startArena(int index);
 
 private:
-    void updateStartAllButton();
+    void populateArenas(const BalancingConfig& balancingConfig);
+    void stopAllArenas();
+    void updateButtons();
 
     struct ArenaEntry
     {
@@ -40,8 +47,12 @@ private:
     };
 
     std::vector<ArenaEntry> m_arenas;
-    const GameConfig& m_gameConfig;
+    GameConfig m_gameConfig;
+    std::string m_configDir;
+    std::string m_balancingConfigPath;
     unsigned int m_nextSeed;
+    QPushButton* m_reloadButton;
     QPushButton* m_startAllButton;
+    QScrollArea* m_scrollArea;
     QTimer* m_pollTimer;
 };