Fix some compile error against qt6

(still need some fix todo. It still uses some kdegames deprecated class)

src/game/score.cpp

@@ -18,7 +18,11 @@ Score::Score(const QString &score)
             m_color = QLatin1Char('B');
         }
         int i = score.indexOf(QLatin1Char(' '));
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         m_score = score.midRef(2, i - 1).toFloat();
+#else
+        m_score = score.mid(2, i - 1).toFloat();
+#endif
         QString upperBound = score.section(QLatin1Char(' '), 3, 3);
         upperBound.chop(1);
         m_upperBound = upperBound.toFloat();

src/game/stone.cpp

@@ -23,7 +23,11 @@ Stone::Stone(const QString &stone, float value)
 {
     if (stone.size() >= 2) {
         m_x = stone[0].toUpper().toLatin1();
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         m_y = stone.midRef(1).toInt();
+#else
+        m_y = stone.mid(1).toInt();
+#endif
     }
 }
 

src/gui/widgets/setupwidget.cpp

@@ -11,6 +11,7 @@
 
 #include <QFile>
 #include <QIcon>
+#include <QRegExp>
 namespace Kigo {
 
 SetupWidget::SetupWidget(Game *game, QWidget *parent)