Replace static_casts by QOverload where possible

Mainly to get rid of the QProcess::finished deprecation warning.

Also adjust coding style in the surrounding connects when needed.

Change-Id: I12f9b248c7974b892c4a069356e578e80f8c59e9
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qbsprojectmanager/qbsprofilessettingspage.cpp

@@ -152,7 +152,7 @@ void QbsProfilesSettingsWidget::refreshKitsList()
         m_ui.kitsComboBox->setCurrentIndex(0);
     displayCurrentProfile();
     connect(m_ui.kitsComboBox,
-            static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            QOverload<int>::of(&QComboBox::currentIndexChanged),
             this, &QbsProfilesSettingsWidget::displayCurrentProfile);
 }