Core: Modernize

modernize-use-auto
modernize-use-nullptr
modernize-use-override
modernize-use-using
modernize-use-default-member-init (partially)

Change-Id: Idf10d7ffb1d98a04edc09a25c35e4e9e3abe87b5
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/systemsettings.cpp

@@ -50,7 +50,7 @@ namespace Core {
 namespace Internal {
 
 SystemSettings::SystemSettings()
-    : m_page(nullptr), m_dialog(0)
+    : m_page(nullptr), m_dialog(nullptr)
 {
     setId(Constants::SETTINGS_ID_SYSTEM);
     setDisplayName(tr("System"));
@@ -187,7 +187,7 @@ void SystemSettings::finish()
 {
     delete m_widget;
     delete m_page;
-    m_page = 0;
+    m_page = nullptr;
 }
 
 void SystemSettings::resetTerminal()