Utils: Modernize further

Many issues, mostly in headers, were not addressed in
e38410b76c

modernize-use-auto
modernize-use-nullptr
modernize-use-override
modernize-use-using
modernize-use-default-member-init
modernize-use-equals-default

Change-Id: I320a51726db881e582b898948d53735ebb06887a
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/consoleprocess_unix.cpp

@@ -43,18 +43,7 @@
 
 namespace Utils {
 
-ConsoleProcessPrivate::ConsoleProcessPrivate() :
-    m_mode(ConsoleProcess::Run),
-    m_appPid(0),
-    m_stubSocket(0),
-    m_tempFile(0),
-    m_error(QProcess::UnknownError),
-    m_settings(0),
-    m_stubConnected(false),
-    m_stubPid(0),
-    m_stubConnectTimer(0)
-{
-}
+ConsoleProcessPrivate::ConsoleProcessPrivate() = default;
 
 ConsoleProcess::ConsoleProcess(QObject *parent)  :
     QObject(parent), d(new ConsoleProcessPrivate)