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/libs/utils/settingsselector.cpp

@@ -73,7 +73,7 @@ SettingsSelector::SettingsSelector(QWidget *parent) :
     connect(m_renameButton, &QAbstractButton::clicked,
             this, &SettingsSelector::renameButtonClicked);
     connect(m_configurationCombo,
-            static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            QOverload<int>::of(&QComboBox::currentIndexChanged),
             this, &SettingsSelector::currentChanged);
 }